The obvious choices really. Grim Fandango, if only for the endless beatnik poetry, "don't pet the cat that way, the telephone is for me" Ahh, remember peak period LA. Sam and Max, Day of the Tentacle, Monkey Island. Great Times.
Also BG, SOA, TOB, PS:T and other abbreviations as well. Though Deus Ex and Anachronox were both fine games too. The scene when Boots and Grumpos are asking for the gangrenous sock = brilliance.