I like the drink cart one because that's the one that drives me the most insane.
After waiting for 15 minutes so the guys in front can all miss the green with an iron, the last thing I want to see is for the girl to drive and stop in the middle of the fairway and I have to wait 10 more minutes while they all buy beer, fumble for their wallets, fumble for cash, make some mildly misogynistic comments to the girl, wait for the guy on the other side of the fairway to come over and tip her, wait for the driver of one of the carts to ask her for a glass of ice, wait for her to put the ice in the cup, wait for him to open the beer and pour it in the cup, etc, etc, etc...