I haven't read through this topic, but the opening post made me think of someone I know, and their ordering habits when eating out. It is virtually IMPOSSIBLE for them to order anything without somehow altering the menu item. And, usually, the item is altered in no less than 4-5 ways. Example....
"I'd like the Asian Chicken Salad. No onions, please. And, could I get the mandarin oranges on the side? Is there any way I could get extra mandarin oranges? Also, instead of the regular Asian dressing, could I get ranch? Oh, and make that extra ranch. On the side, please. Just water to drink. With extra lemon wedges, please. Oh, and could we get more bread? But just the white rolls, not the other ones."
Then, the food comes out, at which point they would ask "Is there cilantro in the salad?" (Waiter nods his head yes). "Oh, OK. Yeah, I can't have any cilantro. I'll break out all over." (Waiter takes the salad back to the kitchen). "I'm pretty sure I told him no cilantro."
Meanwhile, I'm thinking "No you didn't. In the midst of your seven other special requests, you forgot that part."
Secondly, drivers who follow too closely and cause everyone behind them to brake every 5 seconds.