I heard Christopher Wright state that theologians tell lousy jokes, and to illustrate the point, he told this joke. I rather like it.
A friend says to a seminarian, “What subjects are you studying at school?”
The young theologian says, “You know, the usual, Biblical Texts, Church History, Ministry and Systematic Theology.”
The friend asks if he has studied anything on eschatology in his Systematic class.
The seminarian responds, “I think I missed that class. I don’t know much about the subject, but it’s not the end of the world.”