Our senses of smell and taste fade quickly. The play of light and shadow and movement distorts our sense of sight. Our sense of hearing is affected by competing stimuli and requires confirmation by other senses to verify its reliability. Flying through a cloud with no visual reference, their ability to detect up from down deserts them in a matter of seconds. They may be flying upside down and in a dive and yet swear they are flying straight and level.
Senses are reliable only to the extent that several senses agree that a perception is reliable.
Randomness is likely the most common reference for human expectations. The theory of randomness posits that any one outcome is as likely as any other. Casting a six sided die 60 or 600 times should produce a near equal number of each facet. Drawing a heart from a fairly shuffled deck is one in four, an ace one in thirteen, an ace of hearts, one in fifty-two. In fact, it is neither.