I really only have a problem with couples when they interfere with the flow of traffic. I know a lot of people have said this, but I didn't feel like multiquoting so many people.
When I'm in school, walking between classes, I'll be muttering under my breath the entire time, or rather, almost the entire time. This is typical of me when I'm in school between class:
"Zap.. Zap... Half-zap... Zap.. Zap."
My head will be flicking in various directions as I look at people.
What am I doing, you ask?
I'm looking at all the people interfering with traffic. If you're walking on the wrong side, or if you're just standing in the middle of the hallway or something, you get fully zapped by my imaginary electrically charged floor, which I think the school should have. If you're standing against the lockers, making an effort to be out of the way, you only get half-zapped.