Tongue Twister Anyone?

Peter-Piper-Picked-A-Peck-of-Pickled-Peppers. Scott loves this little rhyme! The kids say it to him over and over again and he breaks into a big smile every time. I don't know what it is? He either has a great affinity for language already at his young age or...he is just laughing at how silly we look when we say it. He is so fun at this age.