louis c.k.mething of a mess, a flawed work in progress that must be built and rebuilt over and over from scratch. our own core presentation of tonight's "seriously funny." guy walks into a bar -- >> louis c.k. >> reporter: and everybody loves him, the comedians who consider him best in their game, the crowd who hired sitters on a weeknight just hoping he might drop by. after all, this is the club he enters at the beginning of his critically acclaimed hit show. ♪ louis louis louis this guy has to feel amazing, right? yeah. not so much. >> prepare to be very disappointed with what's going to follow. >> reporter: you see, as the hottest comedian of the moment told me a few hours before, he has no jokes. louis c.k. just tore up his entire act and is starting from scratch with a few scribbled notes. >> bus boy, baby rape. >> reporter: and a gut full of self-doubt. you ever worry that there are a finite number of joins that will come out of your brain? >> yes, it terrifies me, constant worry. every jo