At this point, the hitchhiker jumps out of the car and flees in terror. He looks back and sees someone getting into the car. He yells back "Don't get in!! That car is haunted!". The person getting in replies, "It can't be, I've been pushing it uphill for the last hour".
"Yep. Another passenger faded into nothing without paying. Resolve as 'ghost passenger.'"
In your position I would just pay.
(and yes just in case anyone's wondering, that reaction is completely staged...)