
Aha!
The Big Bang Theory Season 7, Episode 2

Aha. There you go.
Breaking Bad Season 2, Episode 10

Aha!
The Big Bang Theory Season 6, Episode 3

No, I think it's stupid.
Aha!
The Big Bang Theory Season 7, Episode 16

Aha! Good question.
The Big Bang Theory Season 5, Episode 17