Jesus in a lightbulb

The thing that appears above your head when you think to yourself, either silently or out loud, "WWJD?"

When you suddenly have a thought of remorse or guilt, the moment the lighbulb appears above your head, (only this time with a vision of Jesus in it with his hands held out and that puppy-dog look in his eyes...) that makes you stop and rethink your actions and the repercussions of those actions.

Dude: "Hmmm... I probably shouldn't have pocketed that $20 that just fell outta that lil' ol' lady's purse...."

(Result: Jesus appears in a lightbulb above wrong-doer's head).