I booked a last minute car thru Expedia,
after I RETURNED the car it said on my computer that if I want to cancel the reservation it is free of charge (my computer was still on Expedia after completing my reservation before I got the car),
I canceled the car (just for thr fun of it)and guess what they returned the $!
Now I have ethical question...
(I did end up paying a price difference to the Avis (Upgrade+returned a day later))