Humor in the Geneforge series is admittedly few and far between, but I've found that it's really good, so why don't we share some funny moments?
Just now I was storming Benerii-Uss as a loyalist guardian (G2) and when I entered the shaping area, a gamma greeter charged me, it was hostile, but the white text "uh... I greet you" came up over it. Imagining a presumably 10 foot tall wall of glowing muscle, blood thirst in its eyes, charging at me yelling 'welcome' made me fall over laughing.
I also got some good laughs at all the white text comments while passing by the tanks filled with various body parts in that same area.
On an unrelated note, killing everyone and everything as a level 45 guardian is very fun.