A Jewish grandmother is giving directions to her grown grandson who is coming to visit her with his new wife.

“You come to the front door of the apartment. I am in apartment 301. There is a big panel at the front door. With your elbow , push button 301. I will buzz you in. Come inside, the elevator is on the right. Get in, and with your elbow , push 3. When you get out, I’m on the left. With your elbow hit my doorbell.”
“Grandma, that sounds easy,” her grandson says, “but, why am I hitting all these buttons with my elbow?

Grandma replies, “What, you’re coming empty handed?”