Those stairs with turns are the worst; hell, stairs in general are tough to move anything heavy up but the turns add a whole new dimension of suck-age.
We were buying 4 or 5 games from an estate once and the pinball machine that was part of the original deal was missing. The owner had sold it out from under us while we were driving over so to make up for it and not lower her price, she said, "do you want that old Coke machine?"
So we hauled it up one of those staircases with a 180° turn and finally got it outside when she said, "that isn't part of the original deal!".
We nearly killed ourselves getting it out of the basement and now she wants to change the deal again. She settled on selling it for another $100 on top of the original deal.
I don't think she was a bad person, it had to be the stress of being widowed, but damn it's hard to keep your cool (we did) in those situations.