An Exquisite Corpse is a (preferably freewheeling) drawing by two or more partners on a folded sheet of paper where each artist continues the other artist's work with little or no idea of what they've been drawing. I can't recommend doing these enough--they keep the imagination limber. Here are two that I did in collaboration with the estimable illustrator Paul Komoda.
My motto is "I just paint 'em-- I don't explain 'em."