What are some good pranks for a fictional story?

Oh come on? Use that creative mind of yours look at your characters think of all the things you could do with them! Max and Lissa! You could have them doing stupid things throughout the entire story! I suggest using whip cream, wooshie cushion, pie throw in a little monkey, some beatles. If you need more help tell me your user name fanfiction right? Mine is Arrowkid21 just PM me. If it isn't Fanfiction sorry no can do.