Quoting a conversation I had recently with my friend, Hari Prasad Gokul,

Me

If the universe was all laminar flow, and if God was the stirrer, could he just reverse time by stirring backward?

Hari

But I guess, somewhere in between, he lost count of the number of turns.

If you're wondering what laminar flow is, or don't understand the context of this conversation, watch this awesome YouTube video: https://www.youtube.com/watch?v=p08_KlTKP50