There was a tarantula above their friend’s head
Judging by this compilation, finding a spider in your car is a common thing. If they are on the smaller side, it is no big deal. You either kill it or take it outside to live out the rest of its life.
But when they get this big, they can be a problem. Would you tell your friend that there is a stowaway on the ceiling above his head? Our advice is to find a place you can pull over as quickly as possible.