One time when Jerry was in London working on one of the Muppet movies Christine was sick and was in the hospital in New York.  Jerry flew home on the SST to see her.  When he got on the plane and got to his seat he thought the person sitting next to him looked familiar, but both of them were disheveled and the other guy seemed to be asleep.  Jerry was tired and fell asleep right away.  As the plane got closer to the U.S. they both woke up.  Jerry looked again and asked, "Aren't you Al Pacino?"  Al didn't recognize Jerry (he didn't look like a Muppet), but Jerry introduced himself and they started talking.  Eventually the conversation got around to the hassles connected with being a public figure.  Pacino said he couldn't go through an airport without someone stopping him.  Jerry didn't have that problem.  After the plane landed people started getting up from their seats and moving around.  Several of them recognized Pacino and headed toward them.  Jerry got his stuff, tapped Pacino on the shoulder with his knuckles, and said, "See you Al," and walked off the plane.