Please don't take a joke personally. I like having a little fun on DDF. Just kidding around a bit... WOW, people are so intense around here.
Try to develop a sense of humor that does not hinge on making fun of other people. It will help you out in life.
Anyway, someone on SD posted that he had multiple video credits, and when he went to rent a video, it only took off $1 and the rest came from gift card balance. Maybe this is only if you have a gc balance, but strange nonetheless.