...the local kfc's stopped selling chicken twisters, and that screwed me up major time, as that was the only thing I could snarf down in two seconds in the middle of a cramfest, just so that I could make it back to school on time...

but generally, in actual restaurants, I hate it when they stop serving my fave stuff, or when they say that they can't serve it at the moment due to the lack of ingredients. Its usually an excuse for me to either try new things or throw a tantrum