C-O-N...
The Big Bang Theory Season 1, Episode 6
(snaps fingers)
Who Con-- you're out.
The Big Bang Theory Season 5, Episode 14
A very long CON indeed.
The Big Bang Theory Season 12, Episode 7
Comic Con?
The Big Bang Theory Season 5, Episode 7
that can get a person uninvited
to this year's Who Con.
The Big Bang Theory Season 5, Episode 14