I've been messing 'round with some old stuff I haven't heard in a while, and Great White's "Wasted Rock Ranger" came on, and this song makes me laugh my butt off, I haven't heard it in ages, and it makes me remember fun times with my buddies singing along to it.

Another song that will make me grin like a mule eating briars is Coe's "You Never Even Called Me By My Name"

"Cows with Guns" cracks me up every time the line "bad cow pun" is the best one. hehe

and the country sone "I got home at the wrong five o'clock" is another one.

Cows with guns is funny! the steaks were really high and chickens in choppers

The one that did the most was in the South Park movie, but FT rules won't allow me to extend any further...
Jewish rap was also hilarious as was Pretty Fly for a rabbi by Weird Al Jankovic.

"Saskatchewan River Pirate" by the Arrogant Worms - actually just about anything by the Worms.

Many System of a Down songs crack me up. Not because the songs themselves are funny but because they're voices are!!
Loads of random lines crack me up because of the way they're sung!!

The song which most of all brings a smile to my face is the late, great Elvis Presley singing his parody of 'Are you lonesome tonight'. At the line which should go "Do you gaze at your doorstep and picture me there" he sings instead "Do your gaze at your bald head and wish you had hair", and immediately cracks up with laughter. For the rest of the song, he appears to try to get back to the original lyrics, but can't control his laughter, which is truly infectious.
It's just brilliant!

'Ebay' and 'A Complicated Song' by Weird Al Yankovic both made me laugh a lot the first time I heard them. A song which probably isn't supposed to be funny is 'Where Do You Go To my Lovely' by Peter Sarstedt. It's something to do with the 'Just for fun, for a laugh, a-ha-ha-ha' bit. He doesn't sound in the least bit amused and for some reason it's funny.

Here are some of mine:
"Banned from Argo" - Leslie Fish - A hilarious Star Trek filk song. Warning! Do not sing around anyone who you might get offended and slap you! (It's kinda off-color)
"With a Little Bit of Luck" - My Fair Lady by Lerner and Loewe - An interesting outlook on life, and unfortunately kinda like my own.
"Poisoning Pigeons in the Park" - Tom Lehrer - 'Nuff Said.
"Lobachevski" - Tom Lehrer - Should be titled "How to get through college". Just Kidding.

These'll do it:

"They're Coming to Take Me Away, Ha-Haaa!"
-Napoleon XIV

"Sarah Cynthia Sylvia Stout Would Not Take the Garbage Out" -Shel Silverstein

"The Cockroach That Ate Cincinnati"
-Possum

Oh, Whiskychick, I loved "wasted Rock Ranger", another one that always gets me is "mongoloid" by devo and "Big Bad Bill is Sweet William Now" by Van Halen

Mississippi Squirrel Revival by Ray Stevens, to funny.

I can't believe I didn't mention Deryl Dodd's "New Tony Lamas". *smacks forehead* Gar-ron-tee that'll tickle the fire out of you!

The Da Yoopers songs
"Second Week of Deer Camp"
"Beer Guts of America"
"Twenty Yoopers In A Pontoon Boat"

Wow, I haven't heard a single one of any of the songs mentioned.

I blame me being really young or you guys all being elderly.

Def. going to be checking some out though, thanks!

Anything by Tenacious D makes me laugh.