Oh there's quite a number of songs that made me laugh before. Here, have a little handful!
Some of Weird Al's stuff is always good, such as "Frank's 2000" TV", "Smells Like Nirvana", "All About the Pentiums" (What kind of chip you got in there, a Dorito?!)
Carl Douglas's "Kung Fu Fighting" sometimes makes me lol.

(There were funky China men, from funky Chinatown. They were chopping them up, they were chopping them down... Everybody was kung fu fighting. Those cats were fast as lightning!)
"Waltz of the Forest" by Kirbopher and his friends I downloaded from Newgrounds.com is kinda funny. (Super Mario-oh RPG; It is the only one just for me.
When I play the game, I get lost in a phase.
Then I find out I'm stuck in Geno's Maze!
There are many secrets in this game.
Many of which drive some peeps insane...)
There's the Chobobo RoboVoice I found on overclocked remix. (Final Fantasy is an RPG, the only one that I need. It's the RPG for meee! Final Fantasy is all that I play. All other games are lame, it puts them all to shaaame!) I burned that with mostly FF7 and other video game instrumentals on a CD.