The phrase, "Wait for it..."

You know, like a terribly obvious suspense cue...
I've heard this phrase for many years, in many movies, tv shows, and even in comedian's stand up acts. Any ideas where this comes from?

TIA

Mike

I've nothing to back this up but I believe it originated in the British Army. When private soldiers were about to jump the gun by anticipating the next command the Sergeant Major held then back with 'wait for it' (usually + you 'orrible little oiks). That's how it is in English WWII films anyway.