It’s Fun to Know: How a Fly Lands on the Ceiling
So if it’s flying around the room right side up, just how does a fly land on the ceiling? Here’s how: It places its front legs above its head as it approaches the ceiling. Then it grabs the surface with the tiny suction cups on those front feet, and swings its body up until its back legs make contact as well.
(Source: The Straight Dope)
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