Oh, Planescape: Torment has a lot of those. One of my favorites: You notice a ghoul with a severed finger with a magic ring on it, the finger is strapped around ghouls neck. Now if you want to get the ring you have to allow ghoul to bite some of your flesh off (you are immortal regenerating being btw, so no biggie you lose few hp). The ghoul gives you the finger and leaves. Great you have the ring... nope it's cursed and wont slide off the finger. Sooooo.... you can bite off your own finger and attach the other one. It works somehow and you are equiped with cursed ring of protection +1, which is not bad for the beggining of the game. Great game, personal advice if you are willing to play it: play as a mage with high int+wis, otherwise you will miss like half of the content.