What I hate is people (and I have a few friends who sadly fit this category, but no @
Lee isn't one) who think the restaurant is their own personal kitchen. They want to remake the menu ... yes, they'll have the chicken breast special, but no marsala sauce and shrooms could I get BBQ sauce? And the risotto ... can I get the mashed taters from the steak instead and the veggies are they steamed fresh or frozen? if frozen, can I get cole slaw? And can you bring me both Thousand Island and Ranch because I can't decide. And can I have a half Coke, half Diet with no ice?
Oh, and it's worse when you're at a McD's type place with them and you just get your order in first, so it isn't spat on (which should NEVER happen, but you get what you pay for).
Dietary needs (within reason -- again, even if your kid has some weird disease that only 678 people in the state of Arizona have ever been diagnosed with, the restaurant isn't your personal kitchen) are one thing, dropping an item or asking for a swap is easy ... but people really are crazy. I've watched people order and I see this isn't a problem limited to selected Spirited friends.