While running Michigan's Grand Valley Marathon in 1978, about 10 miles into it, Dennis Rainear was hit in the head by a .22-caliber bullet. He didn't know what hit him, so he kept running and managed to finish the race in a time of 3 hours, 9 minutes. Afterwards, he went to a hospital to have the bullet removed. He subsequently became known as "Bullet Man" and kept running marathons. The shooter was never found. More info: "How Getting Shot During A Marathon Made The 'Bullet Man' A Better Runner" Reno Gazette Journal - Nov 11, 1978 Dennis Rainear The bullet that lodged in his head