Say what you will about the quality of The Tonight Show with Jimmy Fallon, but the recurring Mad Lib Theater sketches never fail to crack me up. Such a simple premise. Get famous actors to suggest a series of words, wedge those words into a serious scene, and then try to perform it with a straight face. Almost all of them are funny, but this one with Benedict Cumberbatch has that magical thing where you can see the performers having fun while they’re performing. It’s just really charming and funny.