re: Most annoying pet peeve on the golf course?

People yelling "MASHED POTATOES!" after my tee shot.

I guess my pet peeve is when people have a general lack of situational awareness. They don't realize they're next to putt so they don't start lining up the putt until it's their turn. They leave clubs on the other side of the green instead of the side you're going to walk off. They park the cart at the front of the green where their chip shot is rather than behind it for after they putt out. The only thing more annoying than being held up by a slow group is holding up the group behind you. If I'm in a group with someone that has no awareness of what they're doing, it makes me not want to play with them anymore. You don't have to rush through every shot but be efficient in your actions so that we can get out of the way of the group behind us.