Funhouse (Point Horror) by Diane Hoh - Vintage Paperback

You can die laughing.

When The Devil's Elbow roller coaster goes off its track and several teenagers are hurt, everyone thinks it was just an accident. So no one listens when Tess says she saw someone tampering with the track. — But one person knows it's true. That person is playing a deadly game--and is going to make sure Tess doesn't stand in the way. Tess soon finds she's being terrorized, with threatening notes, menacing phone calls, slashed tires and nasty pranks. When another "accident" occurs in the Funhouse, Tess is sure that she was the intended victim. Who is committing all these horrifying acts? And why?

Tess is just beginning to realize that the Funhouse can scare you...to death.