Performer shows two flat (two dimensional) dice. One die has 3 spots on one side and 4 spots on the reverse. The other has 5 spots on one side and 2 on the other.
You place the dice under a coffee cup, removes the one with a 5 and a 2 and put it in your pocket. Immediately the dice change places. You take out the one with a 4 and a 3 from your pocket and the spectator takes out the one with a 5 and a 2 from under the cup. Both can be examined.