Flipping a toothpaste tube

Go forth and pro­cure your­self a tooth­paste tube. Full is bet­ter. Hold it in one hand, name side up, cap point­ing away from you. Flip it end over end so it makes one rev­o­lu­tion, and catch it. The tube will have rotated, so that the name side is down. This works nine out of ten times. If I try really hard, I can get it to flip with­out rotat­ing, but the nat­ural ten­dency is to rotate.

I don’t under­stand it. Anyone?