It is a line from Pulp Fiction,
and Jett Travolta had a seizure.
(
Redsushi! Whoop! Whoop! Yes, that one!,
Tue 6 Jan 2009, 18:20,
archived)
Don't listen to him!
Uma Thurman orders a $5 milkshake in the diner scene just before they do the dance thang.
EDIT: Hang on, you got that bit, though. I've confused myself.
(
An Eagle in Your Mind,
Tue 6 Jan 2009, 18:27,
archived)