Per 
Special Containment Procedures: MTF-Gamma 15 "Rotten Tomatoes" is to constantly patrol libraries, book stores and similar locations across the United States and Canada. Three instances of SCP-XXXX are contained in Site 14. All other instances are to be incinerated upon collection.
Description: SCP-XXXX refers to a series of joke books titled "Bobble's Blathering Blunders: 50 wisecrackers where you are the punchline!". Each instance of SCP-XXXX depicts a crude illustration of a clown holding a microphone and standing on a stage. The back of the book reads "published by YWTGTHFT".
The contents of SCP-XXXX comprise of a paragraph written by "Bobble";
Thank you for buying!
Are you sick and tired of awful comedy? Have you ever sat through a class where the class hotshot can't keep their pot shut? Do you just find it bone-crunchingly, teeth-gratingly, vertebrae-snappingly IRRITATING when people say stuff that's not funny? Well my friends, this book will be sure to teach you the fun in laugh!
Toodles!
- your old pal Bobble!
Following this is a series of jokes, puns and similar material. When read from SCP-XXXX, these jokes exhibit anomalous properties that cause any humanoid in the area to undergo violent and full body transfiguration at random. These transfigurations are based on the joke's subject matter. The nature of the anomaly, such as the individuals who experience changes in their physical assembly, is undetermined and appears to be random.
Addendum XXXX-1: Discovery
The first ever instance of SCP-XXXX was discovered in ██████, New York in 2006, following an incident in a local nightclub. SCP-XXXX was being used as part of a comedy act where Mr. Reeves, a frequenter of the venue, read a joke from it. This caused all members of the audience to spontaneously combust, causing the building to be set alight. Mr Reeves and the instance were recovered by undercover agents embedded in the New York City fire department and contained for interview.
Interview log: SCP-XXXX initial discovery
Interviewed: Mr. █████ Reeves, present at discovery
Interviewer: Dr. Tate
Foreword: Dr. Tate is interviewing Mr. Reeves regarding SCP-XXXX.
<Begin Log>
Dr. Tate: Mr Reeves, you are a frequent visitor of [REDACTED] comedy club, correct?
Mr. Reeves: Yes. Have been for a long time.
Dr. Tate: Okay. Where did you find the book?
Mr. Reeves: Local library1. After years of attending the club as a viewer, I was finally going to book a slot. I'd always wanted to become a comedian. I, just…
Mr. Reeves is seen pressing his right hand to his forehead and sighing, seemingly upset.
Mr. Reeves I couldn't write any jokes that were funny. No matter how hard I tried, everyone who heard them recoiled in boredom and disappointment, the kind you get when you drink a cold coffee unknowingly.
Mr. Reeves slumps back in his chair, visually disturbed and guilty.
Dr. Tate: So, why did you take out the book? Did you know of it's anomalous properties when you brought it out?
Mr. Reeves: Nope. All there was was a strange title and cover, and I didn't really think anything of that.
Dr. Tate: I see. Isn't it against the rules of these clubs to use material that isn't yours, Mr. Reeves?
Mr. Reeves: Apparently, but when I had been outed, the manager shrugged it off and said it was "perfectly legal", whatever that's supposed to mean.
Dr. Tate: Thank you for your time sir. You are free to go, and sorry about the act.
<End Log>
Closing Statement: Mr. Reeves was administered Class A amnestics and put on watch for thirty days.
Addendum XXXX-2: Testing logs
The following is a series of testing logs used to discern the characteristics of SCP-XXXX's anomalous effects. Tests were conducted in Site 14 by Dr. Tate. All jokes have been highlighted in red.
Test 1 - 03/09/2006
Subject: D-314982
Procedure: D-314982 was placed in the testing unit with six other D-Class personnel and SCP-XXXX. D-314982 was asked to read the first joke in the book, "why did the chicken cross the road? To get to the other side!"
Results: D-298220 immediately started to scream in agonizing pain. Over the course of the next five seconds, D-298220 had instantly turned into a gallus gallus domesticus2 before vanishing five seconds later. Another Foundation site embedded in Augusta, Australia3 reported a chicken identical to D-298220 spontaneously manifesting in the site's kitchen ten seconds after D-298220 vanished.
Test 2 - 09/09/2006
Subject: D-461266
Procedure: D-461266 was placed in the testing unit with two other D Class personnel. D-461266 was asked to read the joke "what crime did the oak tree commit when he broke into the orchard? Treeson!"
Results: Immediately after the joke had been told, D-461266's body started to grow stiffer and larger. Smoke was seen bailing out of her nose while leaves and twigs protruded from her orifices. After approximately 20 minutes, D-461266's body had become a relatively large Quercus4. As soon as D-461266's vocalizations stopped, two law enforcement officers manifested in the neighboring room, cuffing the tree's front two branches. When detained, the police officers claimed they were here to "arrest the criminal for treason". The officers were placed in humanoid containment cells, only to demanifest when the cell doors were shut.
Test 3 - 24/09/2006
Subject: D-298326
Procedure: D-298326 was placed in a testing unit with six other D Class personnel and was asked to read the joke "what do you call a cook at a seafood restaurant sourcing his ingredients through unethical means? Fishy business!"
Results: The testing unit immediately started filling with sesame oil. Guards supervising the experiment were instructed to open the doors to the testing chamber, only to find the doors jammed shut. Thermometers embedded in the testing chamber recorded the oil reaching 200°C, as the three D Class were subsequently fried. After approximately 20 minutes, the sesame oil spontaneously drained through the floor5. The bodies of the three D-Class were recovered fully deep fried. Analysis of all three bodies revealed them to be composed of common seafood cuisine such as crab, cod and coley.
Notes: Despite the morbidity of the test, Dr. Tate seemed pleased with the results, making a proposition for use of SCP-XXXX's properties to create seafood for the cafeteria. Dr. Tate's proposal was denied by the ethics committee on the account of it being "fishy business", amid other concerns.
