For Clark's birthday, I bought him tickets to see Flight of the Conchords. If you click on their name, it will link you to one of my favorite songs of theirs. :) (Not for young ears.)
Flight of the Conchords is two guys from New Zealand who write goofy songs and say goofy things. I think they have a show on HBO, too. Anyways, they are hilarious!
Our really good friends bought tickets also, so we had dinner with them and rode together to share the cost of parking. :)