Upon entering the Party Room in Petscop 9, Paul finds a gift box with a sticker on it. After he interacts with the box, it opens, and a grey spinning pyramid can be seen inside. The pyramid rapidly increases in size and becomes red, only to be covered with a black censor box by the uploader. After staring at it for a few seconds, Paul says "what the fuck".
The video then cuts to show Paul on the other side of the Party Room, seemingly avoiding the gift box as much as possible. Paul seems to have forgotten all about the surprise from earlier.
Some speculate the spinning pyramid to contain either something disturbing or personal to Paul, judging by his startled reaction.