QuoteSnatcher!!!! That was the game that hook me on the whole adventure thing.
Wow. Thanks for the recommendation! Somehow I completely missed this game (not too surprising since I've never owned a Sega), but it is exceptional. I think I'll have to revise my top ten list accordingly!

1. Grim Fandango -- Genius on top of genius on top of genius. The stellar combination of killer graphics and a superb storyline that's worthy of film.
2. The Secret of Monkey Island (Monkey Island 1, the original from 1990) -- Insult sword fighting that can only come from the wit of Orson Scott Card!
3. Maniac Mansion: Day of the Tentacle -- A wonderful cartoony-style adventure game with hysterical historical allusions.
4. The Curse of Monkey Island (Monkey Island 3) -- Inspired voice acting with a graphics reboot that brought Monkey Island back in the late-90s!
5. Snatcher -- a sci-fi thriller wrapped in an adventure game! What a ton of fun!
6. The Longest Journey -- Who doesn't love saving the world? Er, worlds.
7. Monkey Island 2: LeChuck's Revenge (the original from 1991) -- "Leg or no leg, I trust you about as far as I could throw Manhattan."
8. Gabriel Knight: Sins of the Fathers (Gabriel Knight 1) -- Inspired integration of the New Orleans culture, cityscape, and architecture into its puzzles.
9. Ghost Trick: Phantom Detective -- Proving that the genre is still alive and well in 2011, this DS title has crossover appeal to many gamers!
10. Sam & Max Hit the Road -- Hilarity ensues as the furry detectives take the case in this cartoony gaming classic!
Honorable Mentions:
11. The Neverhood -- The adventure genre meets over 3.5 tons of clay and 50,000 frames of animation. Incredible!
12. Indiana Jones and the Fate of Atlantis -- You get to choose the adventure game you want to play: puzzle-heavy, fighting-heavy, or team-based!
13. Broken Sword: The Shadow of the Templars (Broken Sword 1) -- A wonderfully rich story that's sure to keep the player intrigued throughout.
14. King's Quest VI: Heir Today, Gone Tomorrow -- Roberta Williams and Jane Jensen collaborate to create the pinnacle of the King's Quest series.
15. Tales of Monkey Island -- A wonderful reboot of the Monkey Island series nearly ten years after the previous title!
16. Maniac Mansion -- The game that invented LucasArts' famed point and click (SCUMM) interface.