And Then He Just Snapped

What's making the new TMX Elmo laugh like that?

*Denny's death on Grey's Anatomy.
*Drank 12 Natty Lights, realized he pissed himself.
*Found out what a "Dirty Sanchez" is.
*Anything to fill the sheer void in his heart and the utter silence in his fifth-floor studio walk-up.
*Dane Cook's inexplicable success.
*Only way to react to news Interior Department suppressed efforts to recover millions of dollars from oil companies cheating the government.
*Huffing.
*Intelligent Design.
*Saw an old lady fall down the stairs and land on a baby.
*He's manic. Ten minutes later he'll be sobbing uncontrollably, unwilling to leave his box and wondering why he bought 142 shiny things.