Here's what really makes me insane: (And yes, I've experienced multiple variations on this theme, though this isn't an actual occurrence)
Me: (on the phone the weekend before) "So do you or your SO have any allergies I should know about?"
Guest: "Oh, no, neither of us do."
Me: "Any preferences? Anything you hate?"
Guest: "Oh, just make anything, whatever you make will be fine!"
Me: "Are you sure? I was thinking about making Chicken Whatsit, salad and chocolate torte."
Guest: "Sounds great!"
Me: (night of the dinner) "Okay, everyone, it's dinner!"
Guest: "Is that tomato in the salad? I don't like tomato, it gives me a rash."
Me: "Whoops! Well, I have some plain lettuce left, would you like just lettuce?"
Guest: "Oh, no, please don't go to any special trouble."
Guest: (five minutes later) "Is that dark meat chicken? Tom and I don't eat dark meat chicken." (To husband who is wolfing down the Chicken Whatsit) "DO we, Tom?"
Me: (fake smile) "Oh dear, I had no idea. Can I get you something else?"
Guest: "Oh no, I'm fine; I'll just have some more of this bread.
Guest's SO: "You can't really tell it's dark meat, dear."
Guest: "Well, just to be on the safe side, I'll stick to the bread."
Guest: (half an hour later) "Is that dark chocolate? I can't stand dark chocolate. Did you put liqueur in it? Tom doesn't like the taste of liqueur in chocolate. Are those strawberries?" etc.
Me: (managing not to grit my teeth) "I think I have some plain ice cream in the freezer, can I get you two some of that?"
Guest: "OH no, please don't go to any special trouble on our account! We're fine, aren't we, Tom?"
Guest's SO (ruefully eyeing the chocolate torte) "We should probably be heading out soon anyway."
Me: (Oscar-worthy acting) "Oh, would you like some coffee before you go? It's already made and I'm so enjoying our visit."
Guest: "Do you have decaf?" etc.....
Me: (one week later) "So Guest2, would you and Steve like to come over for dinner next week?"
Guest2: (looking concerned) "Oh. Um, I'm not sure. Are you sure you can afford it?"
Me: (astonished) "Good heavens, of course we can, and we'd love to have you. Why do you ask?"
Guest2: "Well, it's just that Guest told me last time they had dinner at your house, there was nothing to eat but bread, and she and Tom had to stop at Taco Bell on the way home..."
I spent an entire summer doing camping weekends with someone just like Guest, and it's only because her husband and mine were such nice guys that I'm not currently wearing an orange jumpsuit and serving 20 to life... well, not really, but you know what I mean.