Thriller Ideas

One: 

• At the start everything seems normal, film starts showing the main character.
• Slight character introduction, the character could have moved to a new school in a new place because of parents job. When in new school makes new friends and we find out about the characters (main) background.
• As film goes on the friend that the main character made is represented as being odd (something seems off about them) and the main character also grows closer to a crush.
• Character is invited around crush's house and friend warns not to go, main character takes it as jealousy and goes anyway.
• Crush turns out to be a psychopath (everything the freaky friend who we believed to be the psycho said is true) represetation changed.
• Friend saves/helps main character and psychopath ends up in jail.

Two: 

• Family move into a house in an isolated small town.
• Teenager of the family hears weird noises in house late at night (screaming etc) 
• Teenager finds out that house has had bad history of murder and suicide 
• When teenager tells parents they don't believe them think it is just an excuse to get them to move back to their old house.
• Odd things start happening to the family. 
• Found out it is a spirit in the house. Parents finally believe teenager.
• Family try to leave, but cant get out.
• Only teenager survives and they end up in a hospital for the mentally insane because no one believes them.

Three:

• Girlfriend and boyfriend are really happy together when the girl starts to go slightly insane (or so the boy thought). She claims an urban legend (something close to slender man) is after her.
• Boy doesn't believe her. 
• Girl commits suicide. Boy is devastated and  doesn't believe she would do that and then thinks that everything she was saying was true. 
• He then researches into this urban legend using his own research and the girls
• in the end the legend (or monster type thing) comes after the by and he will either escape or die and everyone just thinks he killed himself because of the depression of loosing his girlfriend to suicide and know one ever knows the truth.