I just discovered this guy Greer Barnes, and he's hilarious. Judging from the videos looks like he's been around since the early 90's. I caught a re-run of his old Comedy Central special, and I can't find any of it online. Except three one minute clips on Comedy Central's website, that weren't even the best parts. His impressions and sound effects are amazing. Below is a good collection of stuff I could find. Enjoy.
Gays in the Military
Arnold Schwarzenegger and Mike Tyson in a jail cell
Suspicious activities, and Ping Pong in Harlem