The Firesign Theatre, National Lampoon (the magazine), Hunter S. Thompson, and Monty Python all played key roles in the sardonic, slightly twisted and warped sense of humor I share with my peer group from then.
There was also a spinoff, Proctor and Bergman, two of the Firesign members who worked as a duo. I have two of their LPs, and actually got one of them signed when they (or just one, maybe) came into the record store I was working at.