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Have you ever heard of Fanny Chmelar?

In what sport does she compete for Germany? https://www.youtube.com/watch?v=U_Klz5qncZQ

Many years later, Bradley Walsh actually met Fanny Chmelar: https://www.youtube.com/watch?v=rb-DYY0upBo

Can a native English speaker please explain this thread to me? (and any other lost ESL readers)

I've tried reading all these names out loud and don't get what's funny.

Fanny Chmelar is pronounced "Fanny Schmeller", which sounds a bit like "Fanny Smeller"