"Whats in my pocket"

I got a really cool starting class idea from one of my good friends who has been in this racket for awhile. He plays a game called "whats in my pocket" where students are given 20 questions to guess what he has in his pocket. Sounds kind of silly but it really does get students to think about forming good questions and how to narrow down options. The students really get into it and I can tell they are learning as the number of guesses is going down...try it!