So I pick up 3 DVDs at blockbuster for $25. Before I leave I check all of the cases for the DVDs and I see that both the discs for West Side Story are missing. The cashier is very apologetic and asks me if I can find another 3rd DVD. I pick another one out. She does her calculations on her register and says "Well you have 4.22 in credit. Why don't you pick out some candy or pop." I sit there for a second and reply "Isn't it 3 for 25 no matter what DVDs you pick out?" She's says "Well the west side story was 16.99 and the DVD you picked out to replace it was 12.99 so you have some credit." Again, I contemplate again and say "Well I'm just exchanging a DVD for a DVD so it should be even." She replies "No, you have 4.22 in credit." So to make a long story short I picked up 2 bottles of mello yello and 2 packs of twizzlers for free. I feel kinda guilty but I did try to explain it to her. Oh well.