What Is It With Knuckleball Pitchers?

A decade ago I mentioned this insane story about Gaylord Perry:

Like most pitchers, Perry was not renowned for his hitting ability, and in his sophomore season of 1963, his manager Alvin Dark is said to have joked, "They'll put a man on the moon before he hits a home run." There are other variants on the story, but either way, on July 20, 1969, just an hour after the Apollo 11 spacecraft carrying Neil Armstrong and Buzz Aldrin landed on the moon, Perry hit the first home run of his career.

And now I read that fellow knuckler (my high school nickname heh heh heh) Joe Niekro hit exactly one home one in his career and it was off...his own brother. Whack, dawg!