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

Aha.
The Big Bang Theory Season 5, Episode 4

answer the door or should I
open it and say "AHA" again?
The Big Bang Theory Season 7, Episode 2

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

Aha!
The Big Bang Theory Season 6, Episode 3