http://newsimg.bbc.co.uk/sport1/hi/boxing/7698217.stmAfter 256 defeats, you would have thought that boxer Peter Buckley would have got the message sooner.
But after 299 fights, with only 31 wins and 12 draws, the man with the worst record of anybody still involved in the sport is finally hanging up his gloves.
The super-featherweight faces Matin Mohammed on Friday in Birmingham hoping to claim his first win since 2003 and end his remarkable career on a high.
"Win lose or draw, this is definitely my last fight," he said.
Despite the catalogue of losses, Buckley's career has taken in fights against several world champions, including Prince Naseem Hamed, Duke McKenzie, Scott Harrison and Colin McMillan, on his CV.