The main prank that we play with props is for people's birthdays. The special effects people will put a little explosive in the cake so it blows up in their face - that's always fun to play on a guest star or one of the trainees or someone who's new.
The anger that Uncle Junior has comes from my background. My father was the son of an Italian immigrant and I've seen the fire of the Italian temperament. It can be explosive sometimes in ways that are both funny and tragic.