Roger Federer appears alongside Elmo in a new Super Bowl commercial for the running shoe brand, On, that has them debating which letters are actually on the sneaker. Elon Musk uncovers limestone ...

Watch as Elmo sits in an umpire's chair and debates the two letters found on Federer's On-branded sneakers: Is it 'Q' and 'C' or 'O' and 'N'?

In an Instagram video shared by the running shoe brand, Elmo playfully teased Federer about his grip on the alphabet while debating the spelling of the brand's logo. During the exchange ...