"Be my guest"

i once snapped back "thank you for your permission" and she reacted like i had slapped her

it's more like "caveat emptor" when i'm cooking

it struck me the other day that "you're welcome to [stay here for a few nights] [stay for dinner] [join us]" pretty much means "we'd really rather you didn't" 99% of the time, or at least that's the impression i get

like there's always an implied "but" at the end, that isn't said but is the unsung tonic chord of the piece