Quirk of Nature

As I've noted previously, Richard Wiseman posts a variety of videos under the Quirkology brand.  Though ostensibly they're magic tricks, often they're more appropriately optical illusions.  As such, he generally shows how they're done.  And he does all this in a charming, whimsical way making his little excursions treats.

Although Richard Wiseman has performed as a magician, he has a very different day job.  He's a psychologist.  In fact, he's a professor of Public Understanding of Psychology at the University of Hertfordshire. He's written numerous books on the subject, including The Luck Factor and Quirkology.

Here's another in his series of "10 amazing bets you will always win!"

https://www.youtube.com/watch?v=0xDu7NtgtO8