Two cats called "1,2,3" & "un, deux, trois" had a swimming race across the channel.
1,2,3 cat won because un, deux, trois cat sank!
Cat Swimming Race
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Explanation
This is a play on words because 'un, deux, trois' in French sounds like 'one, two, three', and the joke implies that the cat using the French number-names sank because they sounded like the words 'one, two, three' instead of representing numbers, thus they could not swim.