Have you ever "screwed someone over" and had to deal with it later?

[DMBFan23]

OOT,

Have you ever done something, maybe crappy (in your eyes, only in theirs, or both) to someone, that they've later remembered, and have it come back to bite you in the ass later? The story I'm about to lay out made me wonder if it'd happened to anyone else.

So I go out last night for a friend's birthday party. Carpool in Ballston, for those that are familiar. We have a good drunken night of darts and pool, and me and my girlfriend are ready to go home. We call blue top cab, and the guy answers "be there in 15 minutes." Well, 5 minutes later a cab comes that is NOT blue top, and we take it, because, well, finders keepers and all that [censored]. The blue top guy calls when I'm halfway home and says "your cab is outside of carpool," and I tell him I've found alternate transportation. from there you can put two and two together, he was pretty pissed off at me...get it? 2 and 2? 2+2? "lol."

Anyways, fast forward to the next night (tonight). I'm pregaming, drinking with some people, and we want to go out in downtown DC. we're in Arlington, VA, which means we have to take metro or cabs, and we choose cabs. I call blue top since it's saved in my phone, and after a while the guy picks up and says "address and phone number." I give it to him, and he says, "kevin?" I say yes, and he says "you screwed me over last night [censored]" to which I have to only laugh, hang up the phone, and find different transportation to DC for the evening.

So, my questions to you beeyotches:
Have you ever done something possibly crappy to someone and had to deal with the consequences later?

If you call a cab (or make another similar not-very-binding social arrangement) to what degree are you obligated to keep said appointment?