Chip Oliver

Chip Oliver (born April 24, 1944) is a former American football linebacker. He played for the Oakland Raiders from 1968 to 1969. He left the team to join One World Family of the Messiah's World Crusade, he wanted to but was unable to return to the team in 1971. 
in 1971 Oliver tried to get back on the Raider team, by standing and walking on his hands. He had been on a vegetarian diet. Aside from his affiliation with his religious group, it just was not Madden’s choice. Why another team did not show interest is a question.