
If to the HAT you don
while wearing a nightshirt...
The Big Bang Theory Season 4, Episode 21

Okay, do not wear this HAT.
The Big Bang Theory Season 12, Episode 10

l ought to be wearing
a tinfoil HAT, you know?
Breaking Bad Season 4, Episode 7

Yes, but which HAT?
The Big Bang Theory Season 11, Episode 15

It's also a HAT.
The Big Bang Theory Season 11, Episode 13