Coffee Shop Quirks?

Today's Mornin' Grind segment is about Wi-Fi use at coffee shops. But it got me to thinking about java joint etiquette? What gets your goat when you're at the local coffee house?

Line jumpers? Sure, this is annoying, but easy enough to remedy if you don't mind being a little vocal in public.

Computer users? Only if they drape their computer items across several tables and are playing really loud video games or loud videos.

For me, the biggest offender is the loud cell phone user. I don't want to hear your conversation, I really don't.

What about you? What gets your goat when you're simply trying to get your caffeine fix?