Donkey poker
out_un The solution culd be donkey poker. One simply ar given a play card which he does not know and then he rises it to hes/her forhead and does not knov which cart he has. He sees all othe players carts in thei forhead. Then all give stakes like a hell :)
This is a companion discussion topic for the original entry at https://ww2incolor.com/gallery/german-forces/46900/donkey-poker