
A-ha!
The Big Bang Theory Season 9, Episode 13

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

Aha! So I am working with you?
The Big Bang Theory Season 3, Episode 4

Aha!
The Big Bang Theory Season 7, Episode 3

A-ha! You are upset.
The Big Bang Theory Season 10, Episode 20