(BOTH SIGH)
The Big Bang Theory Season 2, Episode 4
(moaning SIGH)
The Big Bang Theory Season 5, Episode 20
(both SIGH)
The Big Bang Theory Season 5, Episode 17
[ALL SIGH]
The Big Bang Theory Season 8, Episode 4
Sigh louder, no one heard you.
The Big Bang Theory Season 10, Episode 1