Magic Underwear. Yes, that's what people call it. Let's laugh at the Mormon in his magic undiepants! In an effort to educate people on the significance of our temple garments, the Church has released an explanatory video. Too bad the one who has mocked me most about it doesn't come to Off Topic anymore (supposedly), and likely won't comment.
For your education:
http://news.yahoo.com/mormons-address-mystery-surrounding-undergarments-195328671.html