The no-win situation

Its very interesting to see how children can grasp the knowledge you pass on to them. A few days ago, I was taught her how to play the coin and the cup game. Now, she is playing with Kaelynn and this is her version:

Pick a cup, any cup except this one (her hands on it)
Pretty soon, after much taunting and losing, Kaelynn
wised up and stopped playing as she now knows
any cup except the one that Kristine is holding,
has has no coins in it.