Last night on Late Show With David Letterman, Anderson Cooper hangs out with a llama left behind by Jack Hanna before engaging in a comedic quarrel with David Letterman over a dubious invitation to appear as a guest on Anderson. Plus: Deena Nicole Cortese demonstrates the "Jersey Turnpike" on "Lean Cuisine" Ed Helms; Kid Cudi, rocking the exclusive Back to the Future Nike Mags, does the "string" dance with Conan; Mark Wahlberg urges his BFF to hurt himself severely, i.e. gulp down two wasabi balls and three glasses of Tabasco filled to the rim at the behest of Wahlberg himself. A taste of what's to come at Wahlburgers? Watch our compilation to see what you missed.