Day of the Tentacle is a classic
LucasArts [point and click]
? adventure, so humour is at a high level.
It's one of the sequels to
ManiacMansion. (The other being [Zak McCracken]
?.)
The Story
The insane and evil Purple tentacle drinks toxic slug, gets hyperintelligent and takes over the world...
[please continue I haven't get enough time]