When someone is really good at something, they can perform even better if they’re in front of an audience. This phenomenon is referred to as social facilitation—enhanced performance on well-rehearsed tasks in the presence of others. On the flip side, if an individual finds a task like dancing difficult, he’s worse in front of the crowd, even if the packed environment is friendly. So, why does the presence of people sometimes strengthen an act and at other times, hinder responses? When watching the game, notice that the player who’s “on” becomes energized. The arousal leads to an amplification of scoring more points. However, the same aroused state causes the improvising dancer to increase the number of incorrect moves, instead of the correct ones. Such states explain why nerves can get the best of someone during crowded routines and play into the so-called “home-team” advantage in sports.