If you weren't sufficiently disturbed by the masses of people riding MUNI last weekend sans pants as part of a global Improv Everywhere stunt, keep that improv fix going on Thursday at Cal Academy's Nightlife. San Francisco's Unscripted Theater Company will be taking "cues from the Academy and the natural world to create a one-of-a-kind show on-the-fly," which is sure to be super weird. Improv with taxidermy, penguins and albino alligators? Get ready.