When your back is against the wall (about to get into a fight, a conflict is about to happen or you’re scared) and you decide to run away or fight.
Jasper and Wade knew they only had two choices when they saw the crowd walking toward them flight or fight. Jasper chose to run off while Wade chose to fight.
A family traveling on an aircraft to somewhere that can't decide what movies to watch in what order before arriving at their destination.
Air Hostess to Mr and Mrs Johnson and the 8 children "Do you really want to spoil this journey for all the passengers just because of your pathetic flight fight?"