Indiana Jones and the Fate of Atlantis
Maniac Mansion: Day of the Tentacle
Sam & Max Hit the Road
Maniac Mansion Deluxe (fan-remake)
Those, in my opinion, are the best computer games in the world, bar none. I also enjoy the TellTale Sam & Max episodes. Never played any other LucasArts games besides the other Indy titles (Infernal Machine, Emperor's Tomb, and Staff of Kings).
Sophia Hapgood does my bidding.