
that can get a person uninvited
to this year's Who Con.
The Big Bang Theory Season 5, Episode 14

C-O-N...
The Big Bang Theory Season 1, Episode 6

Well, you know,
it's Comic Con.
The Big Bang Theory Season 5, Episode 7

But you have the CON.
The Big Bang Theory Season 2, Episode 5

A very long CON indeed.
The Big Bang Theory Season 12, Episode 7