Wally
I am a banana!
If it was me I would scream like no tomorrow and cry in the corner of the elevator and then choke the litle ghost girl I watch way too many horror movies for my own good XD, something like that scares anyone to dead! sometimes pranks like that can bring very dangerous problems on the "victim" like this http://www.youtube.com/watch?v=l5x_8n87Zvw messed up....
Cripes. Very shameless considering:
a) They don't know her
B) They're in her car without her permission (which I have NFI how they got in there)
c) She could have been traumatised as a kid by something as real as someone with a mask.
Could have killed the poor woman