I saw him misplay a fly ball in left field at Shea in 1972(?). Nobody should have to watch Willie Mays misplay a fly ball. I can say I got to see him play in person, and I will always remember the TV Willie Mays--maybe the greatest player ever. But I'll never be able to forget him misplaying that fly ball in left.
I saw Mr. Mays running sprints across the outfield during a spring training game in Phoenix (way more relaxed attitude about spring training games back then). Dick Dietz, the Giants' catcher hit a rocket to right center field, off the fence. Willie, on a dead run, heard the ball hit the fence, grabbed it with one hand, spun, and fired a rocket to second -- and Dietz was out by 40', standing in the basepath looking out at the chagrined Mays. He was pure magic, just watching him run across the warning track. Everybody gets old, but Willie Mays will always be the guy I saw running out from under his hat to make another basket catch. . . then coming up in the next inning and hitting another rocket out of the park.