South Park's introduction to hell was pretty funny.
But I realized, movie hell is always interesting. My favorite would be the character introduction to hell. It's always interesting.
To name a few I can think of like
South Park (and about every other cartoon)
Spawn (a favorite of mine)
Bill & Ted's Bogus Journey (the funniest)
Little Nickey
are there much more?
Hell in What Dreams May Come is pretty interesting and I enjoy seeing the different elements imagined for it, but South Park's would probably have to be my "favorite", as it's the least unpleasant hell I've seen depicted. xD
Robot Hell in Futurama is also fun for its catchy musical number.
I'm gonna go with the one in Coffin Joe's This Night I'll Possess Your Corpse, when it goes into color.
I don't have a license, but I drive very well, officer!