Time Gentlemen, Please!, a direct sequel to Zombie Cow's Ben There, Dan That, is a playground for just about every type of humor that is likely to get you ousted from civil society. It's old-school adventuring at its best and manages to both parody and canonize classic Lucasarts games while providing a stiff set of puzzles to solve.
Ben There, Dan That! is an old-school adventure game in the classic sense. You know how this works. Right click to access the interactive menu. Interact with objects. Pick them up. Use them with other objects. In this game, you default to playing as Ben, but you can switch to being Dan when the occasion calls for it. It features some fairly witty writing with that rather unique British self-deprecating sense of humour.