The Dig! It's my favourite LucasArts adventure game, and I still play it to this day every so often. Never stops being highly enjoyable, even though I've memorized the puzzles and story.
Highly recommend it to anyone who likes point-and-click adventure games! It's on Steam for super cheap (I think it's on Gog.com too).
Because the only reason for my existence is work. I have no value outside of that.