It seems the lad in the Numa Numa video is very embarrassed by all the attention (needs subscription or BugMeNot) he's been getting.
Gary Brolsma has been getting plagued by the attention since the video he recorded got hosted on newgrounds.com (looks like I linked the right source then eh Hans?) then picked up by the rest of the internet. He's now being chased for interviews by the traditional media - he had agreed to do the NBC Today show but cancelled.
Let that be a lesson to you all: Ensure you post nothing on the web you don't want people to see. It's a very public place. How hard is it to figure that one out?