[pyk]

If you have two people, you can have person A ask person B to “pick a random number”, and use heads for odd, tails for even. Don’t tell person B why you’re asking and my guess is you’re relatively random heads/tails. No studies that I am aware of to back this up, so people could be biased towards odd/even, but a bias correction could correct that too.

[l33t2328]

I’d bet people generally think even numbers and multiples of 5 seem less random.

[kzrdude]

3 and 7 seem random :)