Idk if you play games with the kids, but I used to tend to a group of like fourty (yeah. Fourty kids 12 and under and just me. I was 16 -__-) at a day camp, and we loved to play this silly, raucus game where you pick a word ("my chocolate salty balls (from Southpark, its candy)) was the word, and you pick one person to sit in the middle of the circle an they have to say the word you choose when another person pauses in a sentence they create, The object is to get a person to laugh..
Person:" Today I was hungry so I chomped on some...*pause*.."
Chosen person:..."Chocolate salty balls!"
It usually makes them laugh like crazy, to the point where anything, even at one point "pudding" was cracking the kids up.
Make sure, if you want, that dirty/sexual/curse things arent the word and the situation sentence isnt too dirty either.
It was a lot of really silly fun XD <3