"You broke up with a guy over punctuation?" The actual line is ""I've never heard of a relationship being affected by punctuation," but the reference is good enough for us, referring to the exclamation-based ending to Elaine's relationship with Jake Jarmel.
Brilliant...and more at Huffington Post.
It isn't that important, is it?
(plus I was checking to see if editing at a late date was possible. Which it is.)