I've always loved Fallon's lip symc battles (Emma Stone is my favorite). This is no exception. Fallon's Jagger impersonation was spot on. The Risky Business allusion was priceless. Sad that they blew it at the end of the final song though...
I really don't think Jimmy Fallon or lip sync battles are funny. He's almost painful to watch at times, Colbert is going to blow him out of the water.