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'?

Roger Federer and Elmo from Sesame Street seem to disagree on the letters of the alphabet in a Super Bowl ad for ON running shoes.

Many fans will have noticed that the likes of Patrick Mahomes, Travis Kelce and Jalen Hurts wear a 'C' logo embroiled into ...