Mother: Tom， I hear you’ve been fighting with one of those boys next door and have given him a black eye.

Tom: Yeah. You see， they are twins and I want some way to tell them apart. Isn’t it a good way?

Mother: Did you eat all the cookies， Tom?

Tom: Oh， mum， I didn’t touch one.

Mother: That’s strange. There’s only one left.

Tom: That’s the one I didn’t touch.