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.
The Big Bang Theory Season 5, Episode 4
A-ha! You are upset.
The Big Bang Theory Season 10, Episode 20
answer the door or should I
open it and say "AHA" again?
The Big Bang Theory Season 7, Episode 2