What party pieces can you or your family members do, and the departed as well? Here are some of my family's:
My grandfather's trick was being on hands and knees with a glass of water on his bald head, and bending down to drink from another cup on the floor.
I can reach all the way round my head with my left arm, and touch my left ear, as I am double-jointed.
As a child, I could quote whole chapters of books I had read, or things I had watched on TV. (I'm not so good at learning new ones now, but I can still do the old ones.)