// Life motto
final bool scared;
final bool sad;
final bool angry;

if (scared == true) {
  stopScared();
  startHappy();
} else if (sad == true) {
  stopSad();
  startHappy();
} else if (angry == true) {
  stopAngry();
  startHappy();
}
// Let's be happy, not scared, sad or angry
// :)