Today Elmo, sporting baggy pants, hoodie and black sunglasses, rapped out a tune called “Yo Five, No Jive.” It brought me back to when Alvin and the Chipmunks, acorn bling dangling from gold chains, posed gangsta-style on the cover of their self-titled DVD. Next, I predict Oscar the Grouch emerges from his garbage can with diamond grill, do rag and machine gun. Which of our childhood icons will sell out next?