This gif can be used in so many different contexts:
“Wait, did I remember to lock the door?”
Seeing a someone you know from school while shopping
“Shit, going the wrong way”
That mini-heart attack when you don’t feel your phone in your pocket
Period leak
Going to bed and remembering you have homework due the next day
Sudden onset of diarrhea 
Walking down the school hallway and hearing someone insult you 
You notice a stranger following you
When you realize the meaning of life.