How many times do you feel it's acceptable to say "huh?" or "what?"

I think after the second time, you'd have to admit/explain that you are not understanding what they are saying and ask them to try explaining it a different way.

Who wants to carry on a dialogue of:
"The shmiiing poo ih cod."
"What?"
"Da shmiing poo ih cod!"
"What?!"
"DA SHMIIING POO IS CAWD!"
"WHAT!?"
"IT IS CAWD!"
"HUH?!"