Similarly I have quite a few DVDs that I'm a little ashamed of to place in my real collection, for a variety of reasons! Some are of the "what will the neighbours/parents think if they see it?" kind such as Man Behind The Sun, the Guinea Pig films and Nekromantik, but others fall into the category of gifts from well meaning friends and relatives which I'm grateful for having the chance to see (because I wouldn't have bought them myself), but am not sure if I could bear to see them in my
actual collection - things like Mission To Mars, The Da Vinci Code, the Pirates of the Caribbean series, Spider-Man 3,
Strong Language (part of the "Cool Britannia era 20-somethings on drugs, clubbing while having trouble with relationships" wave of the late 90s following Trainspotting that also included Human Traffic),
Storm (with Luke Perry!),
Evil Never Sleeps and
Total Reality! (Though on the flip side of that, a good friend from university gave me a copy of Wilde!)
This does not fit in with DVDs but a couple of years ago a friend of a friend was getting rid of all his videos so he kindly let me have all his Redemption/Jezebel titles for £4! I couldn't pass up that offer for twenty films, though do worry I look (even more of) a pervert with a ton of videos with salacious cover art and titles such as Au Pair Girls, The Sex Thief, The Erotic Dreams of Cleopatra and House Of Whipcord on my shelves!
However there are a couple of abominations that I am completely responsible for choosing to buy - at the moment the award for worst title I actually paid good money for is being contested between Wild Wild West (I guess I got star struck by the casting and didn't realise that the incoherence of the trailer would be mirrored in the film with an extra garnish of 'witty' gay panic, race and disability banter), The Stepford Wives remake ( #-o ) and The Tuxedo (I have no excuse for this

)