Imagine you're a civilian doing a job on the Enterprise (like a waiter or barber), minding your own business, suddenly "RED ALERT RED ALERT" the ship shakes and you get tossed from side to side. Then the alarm stops. You have no clue what happened and your kids are scared. Later a mysterious light wanders through the corridors, engulfing a person in front of you who disappears with a blood-curdling scream. You still don't know what happened. At night you go to sleep in the cabin, and you are woken up by a bizarre being who shouts "RESISTANCE IS USELESS, YOU WILL BE ASSIMILATED!" and he's about to grab your wife. The security guys come in, they shoot him, he screams and emits sparks and the security guys go off to handle another emergency. You still don't understand what's happening...