I have a couple of old CRT televisions at the back of the lab, and bring them out to show what happens when you put a rare-earth magnet in front of them. However I obviously lack the imagination to come up with a show like this. I’ll be more adventurous next time; turn off the lights, turn on the trippy music, burn a few incense candles . . .
Course if I really needed to get the troops interested in Magnetism all I would need is a frog and a very strong magnet.