Boxers are no strangers to low blows - they just don't expect it from their opponent's SON.
American middleweight Willie Monroe Jr was weighing in for his world title challenge against Billy Joe Saunders .
But he was given a shock when Saunders' son Stevie punched him in the groin - and then attempted to kick him.
The two fighters both tipped the scales at 11st 6lb - inside the limit - before they faced off for the cameras.
They then turned to face the photographers - and Stevie seized his chance.