I want the lone ranger's pistol. It has never missed a target at any distance, under any circumstance.
And never needed reloading and never ran out of bullets.
Most of the acme stuff ended in disaster, but since we're talking loony tunes; I think I would go with the bulletproof finger.
Says the dissatified customer Wylie C. Coyote.
Me I'll take the one from both song and cartoons: Walking on Air..........as I can already walk on water.