Three elderly men are sitting in an empty bar, swapping stories about getting old. The first old man says,""My mind is going, I tell you. My kids come over, and I can remember their faces, but I forget all of their names..."" and clangs his beer glass on the bar. The second old man says,""Tell me about it! Why, I can remember all of my kids' names, but I always forget their faces..."" and slams his whiskey glass on the bar. The third old man bursts into laughter, knocking his stein back and forth on the bar. ""Man, you poor saps got it bad! Listen, I can remember the faces **KNOCK KNOCK**, I can remember the names **KNOCK KNOCK**..... Come in!