Yes, of course 3rd Rock From the Sun! I never appreciated the humour back in the late 90's, but watching this show now is amazing. A lot of the humour is derived from these aliens trying to act like humans. Ex: Harry filling up a salt shaker by picking up the grains with tweezers.
One thing I find interesting about the two TV shows that I've covered is that they both happen to be on Cracked.com's Most Soul Crushing Season Finales. Read all about it here.
Anyway, I leave you with one of my favourite theme shows on TV, nothing beats this 50's style guitar: