Great Moments in Writing Instruction

"A sentence is. . . . A sentence is like a. . like something you ride--like a horse!  It can take you anywhere you want to go, but you need to control it. . . and so your punctuation marks are like the, the, the reins that you use. . . to control the, uh, the horse--the sentence. . . so that it doesn't get away from you. . . like this one just got away from me."