Look at the wall behind Peter's desk. Some of things found there are funny.

Newspaper clippings: "Teacher's Death was Natural", "OMG Ten Ghostbusters They are Gonna Blow Your Mind" , "Beware Central Park at Midnight" (good advice), "Vigo Painting Melted: It was awesome when it exploded"
Degrees: "Your Name Here", "Hey", "The Big Apple: To the Cause"