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. The lighthearted advertisement shows the tennis legend and Elmo ...

Join Big Bird, Oscar, Elmo, Bert, Cookie Monster, the Count and many other characters to learn the alphabet and to count with Count von Count, but most of all just have a good time. ABC iview Home ...

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'?