Pretty sure that last one is because the cave-man part of your brain preempts whatever else you're daydreaming about to scan and make sure there isn't a sabertooth tiger waiting to pounce when you enter an area you couldn't see into first, actually. Something like that anyway. Probably reinforced if you had any degree of bully or authority issues in your formative years.
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‎noli esse culus
‎noli esse culus