Riddle: A man is on one side of a river, his dog on the other. The man calls his dog, who immediately crossed the river without getting wet and without using a bridge or a boat. How did the dog do it?
Riddle: A old man once told his grandson that he was a brave soldier in the world war I. He said that he was awarded with a sword reading "proudly presenting to the hero of world war I". The grandson says you are lying. Why?
Answer: Because it wouldn't be labelled world war I before world war II began.