Lonely Island

I know I'm late on this one, but if you haven't listened to The Lonely Island yet, you're missing out big time. The rap duo, made up of the hilarious Andy Samburg and his buddies Akiva Schaffer and Jorma Taccone, first hit the scene with the classic "Dick in a Box" featuring Justin Timberlake. But arguably their best song to date is "I'm on a Boat." 
(Unfortunately YouTube won't let me embed the uncensored version, but the link above will take you to it.)

The Lonely Island |MTV Music

You simply can't beat what T-Pain contributes to this song. His verse might be one of the greatest things I've heard all year. And the best part of all of this is that they don't take themselves seriously at all. 

Believe it or not, but they actually recently released a record called "Incredibad" that features the songs I mentioned above alongside many other comedic gems. You can check out all the videos and material on their Web site or on their YouTube channel.