I've told this story before on here..its in one of the threads somewhere. But anyways....This one time .....we were catching a plane and were at the florida airport and we were taking the elevator. The lady in front of us gasped and said "oh my i thought that was a rat". I smiled and said "dont worry, he thought you were a cow".
I love snappy comebacks, especially when it teaches the person what they just said was really stupid.
The taco comeback was priceless! IF I ever have the chance to use it...i will