John Caldwell is no clown. But John Caldwell knows clowns! (See what we did there?) Anyhow, here are a few pieces of art from the longtime MAD cartoonist's latest, "The Startling Similarities Bewteen Harvard University and Clown College". After you've had a hearty giggle looking at these, check out some more of John's work for MAD here, then go spend some time on Mr.