Famously his shows over-ran to a mind-boggling degree, close to shading into a mass hostage situation as his audiences risked missing trains home etc. Indeed one of the best - as he once described someone else, it was like a fireworks display - boom - kapow - zing - and it didn't matter if you missed one of his gags because there'd be another hundred along in a heartbeat!
(And didn't rely either on swearing, scatology or right-on whingeing about the wicked tories which is what appears to pass for comedy these days for a depressing number of 'comics' in lieu of actually funny material. Thank heavens for people like Tim Vine keeping the flag of Doddy-style family rib-tickling still flying)