Comedy Bulb by Mr. Magic - Trick
You're in control of the bulb's lighting at all times. Use it for a funny lie detector test! Or say you've got a great idea and it lights up! Or perform a card trick and, when the bulb is near the spectator's selected card, it lights up magically! So it can be a mind-reader, too!
Your imagination's the limit with this one. A great gag, and powerful magic at the same time. Enjoy this well-crafted prop - it will bring much enjoyment and wonder to your audience!