because you're wearing
long UNDERWEAR?
The Big Bang Theory Season 5, Episode 23
And is wearing the sexy black
UNDERWEAR you bought.
The Big Bang Theory Season 6, Episode 5
Good call, seeing your Teen Titans
UNDERWEAR really got my motor running.
The Big Bang Theory Season 10, Episode 4
It's a good thing I'm not wearing flag UNDERWEAR
right now because there's about to be a fire.
The Big Bang Theory Season 8, Episode 3
And they... They...
They don't wear UNDERWEAR.
The Big Bang Theory Season 9, Episode 11