Per 
SCP-4378 in it's natural state
Item #: SCP-4378
Object Class: Keter
Special Containment Procedures: SCP-4378 must be guarded at all times and only authorized personnel may be able to enter. Any student who enters the room will be escorted out by a guard immediately. If the student does not comply with guards after three strikes, they will be shot and killed. SCP-4378 must be filled with a supply of motivational posters every month or SCP-4378-A will attack anyone closest to it.
Description: SCP-4378 is a Science room located at ███████ High School. It seems to be an ordinary classroom with motivational posters and student work, but it is very far from ordinary. Sometimes SCP-4378-A can be found in the classroom. SCP-4378-A is a teacher like figure with no face. SCP-4378-A is always seen wearing the same clothes and wearing glasses. The figure will occasionally take down student work and put up new work, but the foundation has never been able to find out whom the work belongs to. While under surveillance, the figure has taken down everything except for a certain poster. The poster seems to have five classroom rules on it.
Test A - 4-27-████
Subject: D-9435
Procedure: D-9435 will go into SCP-4378 just as the school bell rings. He will treat the SCP as if it is a class in school. He will follow every rule on the poster and try to act the best as he can.
Results: D-9435 was left unaffected and walked out with no harm. He was given homework and will return to the SCP tomorrow for another class.
Analysis: SCP-4378-A acted as would a normal teacher during a normal class. He tough about the solar system and the stars.
Test B - 8/14/████
Subject: D-9265
Procedure: D-9265 will go into SCP-4378 just as the school bell rings. He will treat the SCP as if it is a class in school. He will break every rule on the poster and try to act the worst he can.
Results: Every time D-9265 broke a rule, SCP-4378-A got more and more angry with him. Finally, when D-9265 broke the final rule, the room went absolutely dark, so dark that the night vision cameras wouldn’t pick anything up. It stayed dark for three minutes until the lights came up. SCP-4378-A was gone, but D-9265 was lying down on the floor. When MTF operatives went inside to pull out D-9265, he was unresponsive.
Analysis: SCP-4378-A disappeared, but was spotted again two days after the test. It acted as if nothing had happened and it was just a normal school day. Due to the safety of all Class-D’s, no more tests to make this SCP mad will be done.
