This is the one you know it! It slides in smoothly, you can feel the tumblers click into place, and then it stops. You try to push the key in farther, farther, as far as it can go. It keeps going until you lose it in the keyhole. You hear the key jangle as you shake the journal. You start calmly, shaking it progressively more violently as you try to get this infernal key out. 5 minutes later you drop the journal on the ground with a thump! The key jumps out the top and you dive to grab it before it goes back in. Try again.