During batting practice one day in 1988, 6'10" Montreal Expos pitcher Randy Johnson collided head-first with Tim Raines, prompting his teammate to exclaim: "You're a big unit!" The nickname stuck.

Some time later, however, Johnson was apprised of the fact that his new moniker was often misconstrued. "I've had people say, 'Maybe it's not such a good nickname for kids to be wondering about,'" he once explained. "Come on, get your mind out of the gutter!"

[No doubt Johnson would have been dismayed to learn that each of his actual names also had sexual connotations...]