A fun birthday party game is to have an ice cream eating contest. Everyone has to try to eat their ice cream the fastest. Before you begin let everyone know the last person done has to do a truth or dare (so there's incentive).
Then scoop up all the ice cream but instead of putting it into bowls, put it on vinyl placemats! Of course, no spoons allowed!
This is a really fun one to make sure you get video of, because everyone will have ice cream all over their faces!