get your mouse up and remember your swear fighting skills: what is the most classic adventure ever ever ever?
(It is Maniac Mansion, the first point and click, you fools!)
I love first 3 Monkey islands :)
But there is lots of great stuff...
Definitely the first 3 few money island games, I own all of them still, two on steam and two on their original disks.
Definitely I love the 3 first Monkey Island (still, I prefer the 2nd).
In fact if I have to choose 1 adventure as my preferred, I believe Monkey II would be it.
Can't believe nobody's brought up The Dig yet.
Day of the Tentacle and Sam & Max: Hit the Road. That was LucasArts during their golden age.