This right here is rightly filed under "Old But Gold"—the vid dates back to 2002 (!) but even after 12 years, it's still hilarious as ever.
Watch Jamie Kennedy try to lead a class of unsuspecting yoga students—giving suspicious Down Dog adjustments and pissing off construction workers interrupting the Om chanting ("Shut the f*ck up! We're trying to relax!"). Click play on the vid above and get a fun ab workout from the laughs!