You make an accusation and the next poster has to say whether they're "guilty" or "not guilty" of that accusation. Then that poster, makes his/her accusation. It doesn't have to be serious, you can mess around.
Soooo, let's begin:
You have forged a signature before. Guilty or not guilty?
Guilty, who hasn't? When we were younger we used to bunk school and forge notes from our parents claiming we were sick. All was good until one of the more innocent newbies, (surname Ahern) that went with us signed his note "Mammy Ahern"........
You have found money that wasn't yours and kept it even though you knew who had lost it?
You can lead a man to reason, but you cannot make him think.
Sort of guilty - I was once pulled over for making an illegal U-turn and got away without anything, but I wouldn't say I talked my way out of it. The line, "a taxi turned round there the other day," didn't quite wash.