The Sparkklechix In: Mystery of the Missing Milk

> Go to yesterday. You had milk back then!

Then you'd be out of milk a day earlier, because it would have disappeared.

Occam's razor says you ran out of milk yesterday because you went back and time and drank it.

You don't want to cause a paradox, do you? >:c

That is a paradox. It's an ontological paradox. You can't cause your own actions through time travel without a first iteration, in which you ran out of milk anyway.