What is it?: At the risk of too many boating references in one article, the ship cast off on Keaton's career in this 1978 misfire. Keaton's big screen debut was in a film boasting some quality names but which nevertheless failed to come together the way it should have done. Rabbit Test focused on one of the great, largely-untapped comedy premises - that of a pregnant fella. The title is a medical expression, referring to an exercize involving urine and of course rabbits that has passed into healthcare history, and is far too disgusting to be mentioned on a family website. Who helmed this tale named after such a crude procedure? The answer is a surprise and yet makes perfect sense - the late, great Joan Rivers. Billy Crystal became the guy with the morning sickness and some bizarre cravings. Keaton's involvement stretched to a small role as a mute seaman. From this unlikely springboard came Billy Blaze (Night Shift) and Bruce Wayne. Again, images of his moment from Rabbit Test are as hard to come by as, well, a dude with a bun in the oven. So here's a vintage snap of the star circa 1987, apparently nursing a headache.