My friend Bob (and that's actually a real person, not a tv series or film).

BBC Radio 4's 6.30pm comedy slot has a good selection
Have I Got News For You
The Daily Show
Anything with Simon Pegg in it: i.e. Spaced (tv series), Shaun of the Dead, Hot Fuzz.
Gimme Gimme Gimme
Red Dwarf
South Park