Watch: Magic Johnson laments turning down Nike stock on 'Ellen'

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Magic Johnson has done very well for himself financially, but there's one business deal he didn't make that still haunts him to this day.

During a Wednesday appearance on "The Ellen DeGeneres Show," Johnson recalled how, leading up to the 1979 NBA Draft, he received a stock offer from Phil Knight, who had just started Nike. Johnson had little knowledge of stocks at the time and ended up turning down the deal.

"Boy, did I make a mistake," Johnson said. "I'm still kicking myself. Every time I'm in a Nike store, I get mad. I could've been making money off of everybody buying Nikes right now."

Johnson also opened up to DeGeneres about his son, EJ, coming out as gay.