When you can't remember if you already did something or just planned to do it in your head.

I spent twenty minutes looking for my keys in the kitchen before realizing I'd only *imagined* putting them on the counter while still holding them in my hand. My brain had already moved on to congratulating itself for being organized.
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When you're doing something and suddenly realize you can't remember if you already did it or just thought about doing it.

You stand in the kitchen holding your toothbrush, seized by the absolute certainty that you either brushed your teeth two minutes ago or imagined the entire experience with photographic clarity. So you brush them again. And again you cannot tell if this is the third time or the first. By 9 p.m. your gums have filed a restraining order, but at least you'll never know for sure.