50th Birthday Game Ideas?

Ok, here's a fun one and it'll get everyone interacting with each other. Get notecards and put the names of famous people (or infamous, the funnier the better) on them. When each guest arrives, you pin one to their back, and they have to circulate the room asking everyone questions about who they "are", but only questions that can be answered by YES or NO. Use names like AnnaNicole Smith, Oprah, barbara Walters, etc, names that the age group would be somewhat familiar with. You don't want them too easy, but not too difficult either. It really is alot of fun, and gets strangers talking and laughing with each other.