Open top and in trouble

A full on day today with the whole pm taken up by my youngest son being invited to a go kart race birthday party, luckily dads were allowed too. Decided to go open topped in the Z4 to give it a run, now needs a big wash after all the road muck... The kart racing was huge fun, the track was really wet and greasy giving me the advantage against all the teenage lightweight boys. Embarrassingly I won the heat and the races (should have let a teen win maybe!) but could not help it, going sideways in a kart is such fun. Should I be sorry , error no!