Knave of Clubs
A normal deck of cards has just a jack; a tarot deck has both a knave and a knight. The knave is a student, still learning. Here is a story of a knave and a club, from rec.humor.funny:
"A student, in hopes of understanding the Lambda-nature, came to Greenblatt. As they spoke a Multics system hacker walked by. 'Is it true,' asked the student, 'that PL-1 has many of the same data types as Lisp?' Almost before the student had finished his question, Greenblatt shouted, 'FOO!', and hit the student with a stick."