Unfortunately, these are not your Grandfather's underpants.
Yes, it's fart-proof underwear.
"The Under-Ease pants have an in-built multi-layered, replaceable filter made of felt, charcoal and fibreglass wool. To prevent gases escaping without passing through it, the underpants are made from air-tight fabric and completely sealed with elastic around the waistband and legs."
previously in WTF?:
1. rolling grass thing.
2. the Horshack Rorschach.
3. 2006 Darwin Award winners.