This is a special post for quick takes by David Udell. Only they can create top-level comments. Comments here also appear on the Quick Takes page and All Posts page.
You sometimes misspeak... and you sometimes misthink. That is, sometimes your cognitive algorithm a word, and the thought that seemed so unimpeachably obviousin your head... is nevertheless false on a second glance.
Your brain is a messy probabilistic system, so you shouldn't expect its cognitive state to ever perfectly track the state of a distant entity.
I find this funny. I don't know about your brain, but mine sometimes produces something closely resembling noise similar to dreams (admittedly more often in the morning when sleep deprived).
Note that a "distant entity" can be a computation that took place in a different part of your brain! Your thoughts therefore can't perfectly track other thoughts elsewhere in your head -- your whole brain is at all noisy, and so will sometimes distort the information being passed around inside itself.