So true, in my experience.

“Mommy there’s a man down there!” said the youth, upon seeing my father hunched in a low canyon beside the tourist trail in Mammoth Cave. (Surveyors from Cave Research Foundation were not to be seen by the tourists, but this group surprised them.)

“Oh shut up, there’s nobody there” answered the adult attached to the pair of knees beside the kid. This, after that boy had just looked face to face with Roger Brucker, not yet author of book The Longest Cave, and even though his carbide lamp was out, my dad had said “Hi.”