America's Got Talent!

When I was a kid, I had a book of Magical Science Tricks (or was it Scientifical Magic Tricks).  One trick explained how to balance a salt shaker on its edge, using a small pile of salt.  The cube-shaped salt crystals stack up to form a teeny restraining wall. 

This is how I spend my time, now, when I’m waiting for food to arrive in a restaurant.  However, you need the right combination of salt type, table surface, and shaker design for it to work.  The last time it did work, I had to document the achievement.  I don’t know the names of my fellow diners, but you can see they are impressed.