Christian Pyle is suing Leicester City Council, organisers of a ten mile Fun Run, under the Trades Description Act.
"I know it was for charity," says Pyle, "and I'm always keen to help out a good cause. But on this occasion I feel I was seriously misled. Oh, I can't fault them on the running. There was plenty of running all right - ten bleeding miles of it.
Too much running
"In fact, if I'm perfectly honest, I think there was a bit too much running. But the thing is, when I was first invited to take part in this Fun Run, I was under the impression that the element of 'fun' would not be entirely overlooked.
"Actually, the title kind of implies it would share an equal billing with the running. Well, after ten miles I was gasping for breath, sweating like a pig and I felt like I was about to drop dead any minute. In short, I wasn't having the kind of fun that I felt I should be having."
Mr Pyle is concerned that other entrants may also be led astray, and so he is taking this action in order to force the council to rename the event in future.
"I just want them to be a bit more honest," he says. "Rather than calling it a 'Fun Run' why not call it an 'Agonising Jog' or a 'Suicidal Dash'? That way, people will know what they're letting themselves in for."