“Clark, that’s the gift that keeps on giving.” No truer words have ever described a Jelly of the Month Club. Yet, upon my annual family viewing of National Lampoon’s Christmas Vacation, a thought occurred to me that had not in the decades I’ve watched this movie. The idea of a jelly for every month seems quite excessive. Right? After all the best jelly is certainly strawberry, but even that takes me months to eat a single jar. What deranged lunatic would need all that jelly? Perhaps I don’t...