The guy in the grandparent YouTube video suggests shaking the coin in a closed hand (or better, a box) to randomize the starting side and then transferring it unseen to someone else to flip it

Craps is also brought to mind where the dice have to bump the back wall

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roccomathijn 2 years ago | parent [-]

Let's abandon coin flipping in favour of coin shaking then

	▲	dotancohen 2 years ago \| parent [-]
		It's a shake and then a flip. Put your hand on your hip and bend your knees in tight.