I've been asking him for 10 years and still he does it. He keeps a straight face whilst performing it - he honestly looks like he's having a stroke, it's pretty hideous. Think Anne Robinson but swarthier.
It seems grandad taught him how to do it when he was tiny but he only seems to do it to me. DH says 'it's meant with love and affection' but surely that's besides the point if I've told him I hate it?!
AIBU to call him on it every time he does it?