The three biggest influences that warped my sense of humor at a tender young age were Monty Python, National Lampoon and Michael O'Donoghue (aka Mr. Mike). The fact that Michael O'Donoghue essentially created the dark sensibilities of the greatest years of The Lampoon probably just means that this list is only two influences. O'Donoghue then went on to become the head writer for the early years of Saturday Night Live, so... he's kind of a big deal.
A man that is dark, twisted and dead, Michael O'Donoghue created a TV special called Mr. Mike's Mondo Video. Mondo Video was so twisted and perverse that NBC decided they couldn't possibly air it, and it ended up getting a brief and disastrous theatrical release before it ended up on VHS. This is where I discovered the show at 14 years of age. It was such a revelation to me that I ended up doing a public access show with my friends called Round and Round Video. I was the Mr. Mike character, and we did a kung fu skit, lip synched a Sex Pistols song, sang Monty Python's Lumberjack Song, and ended with a shot of a waving American flag set to Jimi Hendrix playing the National Anthem. In short, it was a masterpiece of high school age indulgence and plagiarism.
God bless the youtubes. Love it or hate it, you're about to see Mr. Mike's Mondo Video.