DVD stands for what?

My family rents from Blockbuster on a fairly regular basis, well semi-regular, like maybe once every couple months. We have rarely ever had problems with the rentals being in bad condition, you know scratches or finger prints (totally cleanable). We rented four movies tonight - two for kids and two for us adults in the house. Kids made it thru first movie (a short Scooby Doo cartoon) and were trying to watch second,when one of them came into garage where I was talking to DH and informed me that the "stupid DVD doesnt work"! Huh?
Went in and turns out the DVD is skipping and jumping (we have one of those players with the errrr... progressive scan, looks for the nest good part). IT WAS VERY BADLY SCRATCHED, and I watched my oldest DS put them in carefully. So I take it out and jump in car to Blockbuster, who was most apologetic, and get it swapped for a new non-scratched one. All is well until DH comes in from trying to watch one in garage (yes a DVD/TV/Audio set up in the garage! go figure.....) and says his movie is doing it too. Upon examination, it turns out that there are not only fingerprints, but what looks like cola fizz drops and also, you guessed it, scratches. SO checked the last one, yep, scratched too - one big honking line right thru the middle of the DVD where the actual info is.
By this time it is 10:30pm, but the store is open til midnight. So I head back for a 3rd time, having already called to warn them I am coming, and DH heads for bed (after trying to convince me to stay home and do it tomorrow - nope better to hit same crew).
When I get to store and show guy on duty, he just shakes his head in disbelief - what are the odds we got 3 out of 4 damaged DVDs? So we try a mini-experiment and grab 3 more of each movie.
Guess what? 3 out of 4 copies of the movies are so badly scratched that he sits them aside so they wont go back into circulation.
What do people do with these Dvds when they rent them?! The answer from Blockbuster worker dude? "Oh you know, use them for cup coasters, they fling them down wherever, sand or not." And apparently leave them next to a newly opened, fizzing soda can. Sheesh... One even apparently looked like it had water damage.
SO if anyone out there has any ideas what DVD stands for please let me know......because apparently it is not Digital Video Disc!