You aren't gonna believe this but I have 2 friends that deliver for brown and drag home all kinds of bikes they find in dumpsters--nice ones. I would break the frame first like Oak said so no one will get hurt but if anyone is dumpster diving, I'm sure it will get put to good use. I know you don't want to do that but putting it in the dumpster doesn't necessarily mean it will get trashed--it might get recycled.