The legends of Russia(TLR)

— Do Russians sing Happy Birthday to you in Russian?
— No, We don't. have it
— So what do you sing?
— "Let pedestrians run clumsily across the through puddles."
— Sorry?
— "Let pedestrians run clumsily across the through puddles."
— Okay, What else?
— And "let water flow like a river down the pavement".
— Mmm and do you sing this stuff on your birthday?
— Yes, sir )

It sounds crazy!!! Why?

Regards,

Simon.