White Lies

White Lies is simple. Randomly pick a stone (don't show anyone the color).
White stone? You must lie.
Black stone? You must tell the truth.
Now take a card:
"Show the group your foot, then tell them your shoe size."
"Tell the group about a scar on your body and how you got it."
"What's the best trick you can currently perform on a trampoline?"
Who lies? Who tells the truth? Be the first to guess, and win.
Let the best lie detector win!