I've seen some great comedy shows at the Hollywood Improv over the years!
There was the time this unknown young comic from the Bay Area mesmerized a jaded, invite-only Hollywood crowd by switching from character-to-character at an alarming warp speed, named Robin Williams, who joined another unknown named Andy Kauffman and a barely known Jay Leno, at the Ten Year Anniversary of Budd Friedman's Improv, as it was known back then.
And the time I first fell in love with the outrageous and cute Jewish potty-mouth from New Hampshire named Sarah Silverman.