"Knock, knock." "Who’s there?" "Spinach" "Spinach, who?" "Spinaching me so long I have to scratch.   "Of all the dumb jokes that have been told, the "knock, knock" jokes take the prize for silliness. But now that I have your attention, I want to take a running broad jump from the ridiculous to the sublime. I have something important to say. The doors of life offer many surprises. And the most important question we ever ask is "Who's there?" Jesus said to the church at Laodicea, "Here I am! I stand at the door and knock. If anyone hears my voice and opens the door, I will come in and eat with him, and he with me" (Revelation 3:20). Commit that verse to memory. You never know when you might need it. "Knock, knock." "Who's there?" "Jesus!" And that's no joke!