Now for a change of pace... How about this? Sadly, I *still* haven't read the entire series, but I did read the first three as a teenager. They were hilarious then, and still are now.
I was a really a really big fan of My Teacher is an Alien series when I was a kid. My Teacher is an Alien (1989) My Teacher Fried my Brains (1991) My Teacher Glows in the Dark (1991) My Teacher Flunked the Planet (1992) It is basically about, spies from an alien confederation who travel to Earth to learn more about the human race, who interestingly see humans as a race of beings who have the most potential for intelligence out of all other known races.