
No, I do not have a SARCASM sign.
The Big Bang Theory Season 1, Episode 2

Sarcasm?
The Big Bang Theory Season 2, Episode 14

You know, understanding SARCASM.
Feigning interest in others.
The Big Bang Theory Season 6, Episode 8

...do I have to hold up a SARCASM sign
every time I open my mouth?
The Big Bang Theory Season 1, Episode 2

But I have been getting better with SARCASM
if you want to give that a try.
The Big Bang Theory Season 8, Episode 24