Really depends on my mood: 1) Jump up in the air and pump my fist, two times! 2) Make an "X" with my forearms and make a buzzer noise. 3) Do the field goal sign like |___| so I can tell the opponent how much he/she missed. 4) Yells "FAULT!" when the serve hits the net. 5) Yells "OUT!" on balls that hits the fence, or flies into other courts.