The trailer for Showtime’s I’m Dying Up Here shows the seedy side of ’70s stand-up

Life among professional comedians is not just a continuous throng of laughter. There is a lot of laughter, but at least half of it is mean-spirited, directed at fellow comedians perceived to be unfairly more successful or justly less successful. There’s also a good deal of complaining, a fair amount of gloating, and a…