Here's the joke...

While I sat in the reception area of my doctor's office, a woman rolled an elderly man in a wheelchair into the room. As she went to the receptionist's desk, the man sat there, alone and silent. Just as I was thinking I should make small talk with him, a little boy slipped off his mother's lap and walked over to the wheelchair. Placing his hand on the man's, he said, I know how you feel. My Mom makes me ride in the stroller too.