Just curious if anyone else shakes their milk?

Not too long ago the wife heard about this somewhere, so...

Every time I'm in the fridge, I grab the gallon jug of milk, and shake the daylights out of it...

When I do this, the milk will go as much as 12 days past the expiration date before it 'turns'.
When I don't, most times it'll turn within 2 days either way of the expy...

Weird, but I'm convinced it works!