Maybe this is obvious, but are "Lightspeed Briefs" meant to be a pun on Fruit of the Loom (often abbreviated as FTL) and the scifi trope of FTL (faster than light) travel?
That was my thought when I first saw this episode many years ago and I can't tell if I'm reaching or it's one of those things that's obvious to everyone else.
I'd say it's highly likely that is an intentional pun. Several of the show's writing staff hold advanced STEM degrees. One of them wrote a mathematical proof specifically to include as a plot device in one episode[1].
That was my thought when I first saw this episode many years ago and I can't tell if I'm reaching or it's one of those things that's obvious to everyone else.