Mine is Planes, Trains, and Automobiles , where steve martin is on his way to see his family for thanksgiving, and his flight is delayed , and he goes on a crazy adventure with John Candy. It is halirious.
When I was young, there was a movie, PBS or an after school special, with someone dressed as a large turkey running around. It was in the late 70's or early 80's and was very popular for a few years. Within the context of the movie, we were supposed to believe that it was an actual turkey. Regardless, "Planes, Trains, and Automobiles" and Charlie Brown are both great. Of course, "Planes, Trains, and Automobiles" has an unfortunate score which we will have to forgive, as it was the 80's.