This trick question asks: How can you drop a raw egg onto a concrete floor without cracking the floor?
The answer is: just drop the egg — the concrete floor is very unlikely to crack.
The wording encourages you to worry about protecting the egg, because raw eggs are fragile and usually break when dropped.
But the question never asks how to keep the egg from cracking. It asks how to avoid cracking the floor.
A normal concrete floor is much stronger than a raw egg, so dropping an egg on it is not going to crack the concrete under ordinary circumstances.
The riddle works by directing your attention toward the fragile object and away from the exact wording. Reading the question carefully reveals that the difficult-sounding challenge is actually very easy.
