Louis C.K.’s stand-up comedy challenges growing fan base

louis _CK_photoBy Peter Hartlaub, SFGate.com | Louis C.K. has had a string of recent successes — upending the economic landscape of stand-up comedy, receiving adulation on multiple platforms and even voicing the alpha dog in the just-released PG-rated box office juggernaut “The Secret Life of Pets.”

And yet he still paces the stage with the hesitant vibe of a man on the precipice of failure, as if a mugger or old girlfriend could appear through the curtains at any time, and rob or humiliate him in front of a crowd of several thousand.