I don't bait at all as I'm on public land most of the time, but how could it be possible to spook deer?

My logic is based on all those TV shows with all out feeder troughs. Does a deer approach that 150lbs of corn raised off the ground 2.5 feet and say "I'd better run away because this doesn't look natural" or look at those giant motion sensor activated things in Texas that drop corn right on top of the deer while they're standing there. They're not saying "it's raining corn I better run"

Moral of my unexperienced, strictly observation story is that once they're used to it I think they'd consider it a gift from the heavens before a threat.