An elderly grandmother was giving her grandson directions to her apartment.

Grandma: “I am in apartment 4012. There is a big panel at the front door.
With your elbow, push button 4012. I will buzz you in.

When you get out, I’m on the left. With your elbow, hit my doorbell.”

Grandson: “Grandma, that sounds easy. But, why am I hitting all these buttons
with my elbow?