Okay, do not wear this HAT.
The Big Bang Theory Season 12, Episode 10
...tending an herb garden
without wearing a HAT or sunblock?
The Big Bang Theory Season 4, Episode 20
Maybe pick names out of a HAT.
The Big Bang Theory Season 7, Episode 3
Frosty is merely a bit of frozen
supernatural ephemera in a stolen HAT.
The Big Bang Theory Season 3, Episode 11
a Helmet of Confusion spell
on Billy the Kid's cowboy HAT?
The Big Bang Theory Season 5, Episode 10