You've probably heard the expression "when pigs fly," but did you know that in Spain they say "when frogs grow hair" and in Nigeria "when chickens have teeth"? A rib-tickling collection of idioms from around the world. But the question is: will you believe them...?

You've probably heard the expression "e;when pigs fly,"e; but did you know that in Spain they say "e;when frogs grow hair"e; and in Nigeria "e;when chickens have teeth"e;? A rib-tickling collection of idioms from around the world. But the question is: will you believe them...?