One time as I was walking away from a door that I thought no one was at, it suddenly opened and startled me. I was really flustered and sort of forgot how to talk. All I could get out was "Uh, we're just some Jehovah's Witnesses..." The man promptly shut the door.
Another thing I used to do alot was instead of telling people to "have a good day", I would say "have a good idea". I hated when I did that!