Walken vs Reeve

Listen up, buttercup! This joke is playing on the names of two famous actors, Christopher Walken and Christopher Reeve. Walken is still kickin', but Reeve, sadly, isn't because he had a horse riding accident. It's dark, I know, but the 'opposite' part is that one Christopher can walk, and the other can't. Get it? You probably don't, since you are reading this explanation.