I just ran across the following quote by Einstein:
"Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity."
I never thought of Einstein as a marketer (or a comedian for that matter), but he does a great job of communicating his theory in familiar yet memorable terms. And he made me laugh out loud while doing so.