Here is another cool gift idea for science enthusiasts in your life. This Tesla Coil Arc Plasma Speaker puts on a show at it plays your music. It can release lightnings more up to 7.8″. The size of the arc can be adjusted. You can further experiment with this by lighting glow tubes and lamps.
While this is a fun toy, you should do your homework before using it. For instance, you wouldn’t want to touch the electrodes or get too close when it is active. You can find out more about it here.