Race Across America Puns

Heard this one on the radio during the Sunday Puzzle segment on NPR's Weekend America yesterday. A grandfatherly contestant on the program (named Gérard) asked this riddle of NYTimes puzzlemaster and Yale enigmatologist Will Shortz:

"Two cats are competing to see who would win in a race swimming across the English Channel. The cats' names are One-Two-Three Cat and Un-Deux-Trois Cat. Who won?"

Shortz was stumped. The contestant answered the riddle saying:

"The English cat, One-Two-Three Cat won because Un-Deux-Trois-Quatre-Cinq."