ssa all, former pommy now aussie sikh in the house...
'is that a tennis ball on your head?'
'what would happen if you cut your hair, will you get hit by a forcefield from the sky?'
i've had this one twice, from deadly serious people... 'are you christian?'
classics:
'do you ever wash your hair / how do you wash your hair?'
'do you ever take your turban off / do you sleep with your turban on?'
classic remark: 'don't f*** with him, he's got a beard!'