From a Long Beach submicioner:
If you pulled out a muff roll, would the whole thing fall down like so many Jenga games? Maybe if you just kind of teased out the top left muff a little bit with your finger tip and blew on it a little. Next time you see one, give it a gentle flick. Either you'll find the answer to our question, or you'll hit the fabled Meximuff G-spot. I like them odds.