Someone who looks really hot seen from a distance who when viewed in close proximity turns out to be butt ugly.
That hot guy walking up the beach turned out to be a fat grandpa, what a thumbnail!
The thus unproven theory by which reality slips into an alternate universe resulting in mass ignorance and denial about observable cause and effect in social, economic and environmental patterns that empirical data clearly shows to be true. Reality Slip has been most observed in rural areas, the American South, and red states, though it can occur anywhere at any time.
Interesting speech Ms. Palin, you looked great, except your reality slip was showing.