Risen 2: Dark Waters is Pirahna Bytes' sequel to the high-fantasy Risen. It's an RPG set in a gritty open world populated by wild beasts, creatures of the deep, and just terrible, terrible people. But that's all part of the fun: The atmosphere created by the brutal world and the characters you'll come across are why you want this game. Conversations contain perpetual swearing throughout, with some really well-written and funny dialogue, especially when you unlock Jaffa as a crew member, who's a blessing when you have to deal with fairly poor combat and dull boss battles.
Risen 2 is super difficult when you first start it because of a weird progression system that requires money to unlock skills. The catch is that you need skills to get money, so it takes a while before you can really do much. You can eventually choose to learn Voodoo (Risen 2's version of magic), where you can control people, which is awesome! But unfortunately, the overall story is nothing to write home about.
The giggles you'll have just from being in the world of Risen 2: Dark Waters is enough for it to make the list, though.