Soda can serial shaker

I have a very odd compulsion. Whenever I walk past a can of soda pop, I grab the can, shake it, and then set it down again in the same exact spot.

For some reason, I never have the urge to do this with bottled soda pop, and I'd never shake up a can while someone was standing there, intently watching me. But if I'm walking past a vending cart and there's cans of soda sitting there, oh so innocent, waiting for someone to purchase them.... then I feel compelled to shake it up.

Yes, I realize that sooner or later someone's going to buy the can of soda that I have violated and it's going to be either flat or explode in their face, but I can't help it. Is this a normal compulsion?