Some comedy-sketch ideas from PeterRogers.

The sick drinks skit
People ordering drinks with offensive names.
Artists That Shouldn't Do Advertisements for the Gap
Various inappropriate covers of Supertramp.
Everyone's Gilbert
A skit designed to be as annoying as humanly possible.
Kicked Out of the Hall of Justice
Superheroes grouse about being banned.
[Behind the Music
Bob Apthorpe] : Filmed piece about Bob's musical non-career.
Ways to Screw with Telemarketers
Self-explanatory.
Guinness Ad
Guinness-man a la Kool-aid man.
SingingToCarStereo
The smallest, lamest skit of them all
CelebritiesAsPimps
A series of impressions of celebrities as pimps.
GilbertSullivanAnaconda
The Ice-Cube giant-snake action flick, presented as 19th-century light opera.
NonverbalCharacterTheatre
Meow-meow Pussycat, the Swedish Chef, and Chewbacca, working an office job. Courtesy of MattVance.
PsychoticLettersToPenthouse
Just a title, at present.
TheScrububellum2000
An ad for the patented "Brain Scrubber" (tm)
SupremeCourtClerks
Jay and Silent Bob strike back at ABC's new Supreme-Court drama.
GolfingApocalypse
If a golf tournament got interrupted by the Rapture, would the commentators notice?
ThePeople'sCourt?
Wapner addresses the Palestine-Israel conflict, or something similar.
Now, *That* Would Be Funny
Comedy writers pitch ever-more disgusting ideas.
GuideToStalking
Helpful hints for the would-be stalker.

See also Bob's sketch ideas.