On the latest episode of Keeping Up With The Kardashians the reality clan enjoy a knock-about on the tennis court, apparently a family tradition from when Kris was married to her first husband Robert Kardashian.
However things go a bit pear-shaped when Kris starts making some noises which don't sound particularly Serena Williams-like.
Kim, who's playing against her, can’t stop making fun of her mother while she rallies the ball, making these suggestive grunts.
Kourtney, watching from the sidelines, decides to bring brother Rob Kardashian in on the joke by phoning him and asking, "Do you wanna hear Mum have sex?"
Kris seems oblivious to her grunts. Kim, however, went a little too far by saying, "Is that the kind of noise you make when balls are flying at your face?"
Would you ever speak to your mother like that?