Richard Wiseman’s quirky antics in this video challenge your powers of observation. Can you figure out the trick?

Professor Richard Wiseman is a quirky guy whose reigning title as Professor of Quirkology will never be challenged. He’s been doing amazing illusions and explaining them for years—but these aren’t magicians’ methods. They are based on the science of optics, deception, and just generally screwing with your head. Here he makes a very large ball appear from nowhere, but make sure you watch the whole video to see just how he does it.

Matt Pritchard, British Science Magician, makes a practice out of making people’s brains explode. Here’s a sample. Watch close!