"Chimpanzee That! Monkey News."
To quote the classic Something Awful-ism, it's "teh funnay". It's popular, too. It's why I got weird looks from a lady on the bus for appearing to laugh at nothing. It's also why my girlfriend shot a curious / irritated look at me on the plane the other day... to her, I appeared to be laughing at the back of the seat in front of me. But that's not what it was...
It's the The Ricky Gervais Show podcast. Try not to laugh every time Gervais cackles at Karl Pilkington's inane insights.