Originally Posted by: Cryptic ExcretionsDun dun dun is typically used to represent a heavy piano at a moment of tension and surprise.

Example:

Jonathan: Mary, I want you to know something about me, something dark
Mary: What is it, Jonathan, what could this dark secret be?
DUN DUN DUN
Jonathan: I am your father

Wait a minute.. let me make sure I got this right. How's this:

Roberto: I really like those pants. They are the pants' pants, as it were.
Jeff: Will you shut up about pants, already? That's two straight days you've been ranting about pants!
Roberto: Well, if you only knew why I loved pants so...
Jeff: Okay, let's have it.
Roberto: They.... they....
DUN DUN DUN
Roberto: What the--?