In case Grandma wasn’t as strict with you as she was with me.
Understandable in my case. I recall I had an elaborate ritual known as pretending to wash my hands. I have no idea why I went to all the trouble of turning on the spigots running them for twenty seconds, wet the soap and damp the hand towel when it would have been a hell of a lot easier just to wash my freaking hands.
And spare my aged Grandma the effort of having to give my dumbass a swat.