one man was rising a bike in a road and suddenly  he stopped in a traffic light  and started to itch his helmet,,  some people were walking by the road and one of them saw that and he was surprised and suddenly ran near the bike and asked that rider

why did u itch your helmet. do u fell that itching in your head?

and rider was v angry and  replied you basterd do u itch your butt taking off your paints. its the same thing.