Herman Cohen, the Hollywood producer who has died aged 76, founded a new cinematic genre as the man responsible for the schlock-horror classic I was a Teenage Werewolf, a hilarious farrago that combined the themes of teenage angst and monsters.Made in 1957 as a drive-in quickie for less than $100,000, I was a Teenage Werewolf was pilloried by film critics for its tacky props, ham acting and corny lines. But it became a surprise hit, grossing more than $2 million at the box office.Its plot concerns a troubled adolescent, Tony Rivers (Michael Landon), who turns to a hypnotherapist (Whit Bissell)...