I can "magnetize" two objects.
assistant skeptic holds the two objects together, firmly. I make my voice hypnotic and tell them to focus on the objects, to imagine them melding together and becoming one. I describe the muscles in their arm pushing them together. I take a wand and pass it around the clenched fists and their pressed-together objects. With a whisper I remind the person doing the pushing that the objects are only plastic, that there's no way they could be magnetized...then with a WHOOP announce it is time to pull them apart.
The confused assistant is usually amazed at the feeling of magnetism that lasts, briefly, in the objects in their hands. The times they aren't I ask wisely "Well, what were you thinking of, instead of those XYZs?"
I've done it with Nativity figurines, large bottle caps, and hard plastic cups. It seems they have to be similar in size and mass.