Which major sports brand's mascot was actually created as a result of a manufacturing error rather than intentional design?

How well do you know the stories behind famous sports brand mascots? Some mascots have become as iconic as the brands themselves, driving recognition and emotional connections with fans. This trivia question explores an interesting connection between a major sports brand's mascot and its unexpected origin story. Test your knowledge of sports marketing and brand identity with this challenging question!

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Nike's 'Swoosh' character (originally called 'Swooshie' in early marketing campaigns)
Adidas' 'Trefoil Man' (which preceded the modern three stripes logo)
PUMA's leaping cat (which was initially drawn incorrectly on promotional materials)
Under Armour's 'Power Bobcat' (which emerged when a printing error transformed their logo in 2006)