Duel Week! Topic: Underpants

"You know, Hobbes, some days even my lucky rocket ship underpants don't help."

~Bill Watterson (Calvin and Hobbes)

VS

"'Bursar?'
'Yes, Archchancellor?'
'You ain't a member of some secret society or somethin', are you?'
'Me? No, Archchancellor.'
'Then it'd be a damn good idea to take your underpants off your head.'"

~Terry Pratchett

Where can I find some adult-sized lucky rocket ship underpants? I think I would be much more efficient if I had some.