Well, you ate most of it already so...
4 seconds sound clip from the Fast Times at Ridgemont High movie soundboard.
You can hear this line at 00:30:27 in the Blu-ray version of the movie.
Quote context
[...]
- Yes. This is not the best breakfast I ever ate and I'd like my money back.
- Okay. I believe you have to fill out a form for that.
- No. I'd like my money back now.
- I'm sorry. It doesn't work that way. You see, I have to fill out a form.
- Well, you ate most of it already so...
- Sir, if you'd just wait a minute.
- Look. Just put your little hand back in the cash register and give me my $2.75 back, please, Brad.
- Sir, if you'd just give me a minute. I'll find the forms. I'll take care of everything.
- I don't have a minute. You've made me late enough.
[...]