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

Hold on to your
conductor's HAT.
The Big Bang Theory Season 7, Episode 15

He's wearing a HAT,
glasses and a red-striped shirt!
The Big Bang Theory Season 6, Episode 4

"Nice HAT, Bob Tahecin."
The Big Bang Theory Season 5, Episode 12

THAT is not
a HAT! Oh!
The Big Bang Theory Season 12, Episode 7