From The Northern Echo:
Richy Wade, from Darlington, attended the [Newton Aycliffe 10k] at the town’s Greenfield Community College with his family to take part in the 3k fun run which takes place alongside the main race.
After completing the short course, he decided to watch the 10k runners set off – and got so excited he joined in, even though he had not registered in advance.
He ended up running the route in a highly creditable time of 49 minutes – while wearing jeans and clutching his number from the fun run in his hand.
h/t to Mike over at Running Is Funny