With Seven Pounds sputtering and stalling right out of the gate, Will Smith had little reason to laugh last night on The Late Show. Fake-laugh, though? Watch and learn from the best.

Even the generally unflappable David Letterman seems to marvel at Smith's pseudogiddy range: the "Oh, a magazine photo of me" chuckle; the "What the fuck am I doing here" guffaw; the "I wasn't listening to your question" belly laugh; and other bought-and-paid for Celebrity Centre chestnuts.

Or, a little more optimistically, Smith was conditioning himself for his upcoming film It's Gonna Be Hot, which will reteam the Oscar nominee with his Seven Pounds director for the stirring true story of Arthur, a Port-au-Prince meteorologist whose hearty good humor and uncanny skill save thousands of underprivileged Haitians from the most scorching heat wave in a generation. Like Schindler's List, but with weather. Tell us we're wrong:

[Thanks to video whizzes Mike Byhoff and Josh Rachford for the editing.]