A Filipino traditional game involves 2 players. One covers his eyes with a hand while the other flicks a finger (pitik) over the hand covering the eyes. The person with the covered eyes gives a number with his hand the same time the other does. If their numbers are the same, then they exchange roles in the game. Another version of this is that the blind (bulag) will try to guess the finger that the other person used to flick him/her.(wiki)