I was watching 60 screamers all at once from YouTube Channel Raptor Daptor. On 8:39 this one of the screamers starts like in the frame at the beginning.
Then a video starts with all the characters from Team Fortress 2 dancing with the inscription. Example: it was a prank!. After this, the screamer SCP-096 fron LIGHTS WE OFF begins. After the screamer at the end it says: Happy of 4th July! Help find pls.