These two children were talking, and one boy was assuring the girl that his big ball would fall faster than her ball, which was smaller. When I heard this, I was naturally amused, and laughed.
The boy leaned over and whispered (children fashion),"Wait, till I do it, then he'll laugh on the other side of his face."
So, what does "laughing on the other side of your face" mean?
Best Answer
There's an interesting post about it here. Possible origins he mentions are head of Janus (a Roman mythological figure with two faces on either side of his head), or the tragic/Comic masks originating from Greek theatre.