NEW PLOT IDEAS!
(not super detailed but they're starters!)

[hider=Secret project activated.]"One day you wake up and have the ability to accurately tell if someone is lying. Your new ability tells you that your best friend is lying about everything. Including their name."

The friend who figured out that people were lying is actually a government experiment that the 'friend' was sent to watch over. For when the individual's time came they were going to go on a mission together. (from there I'm not sure where we'd go but we could go somewhere).[/hider]

[hider=You're not where you should be.]"One day you wake up and have the ability to accurately tell if someone is lying. Your new ability tells you that your best friend is lying about everything. Including their name." 

The character who can tell the truth isn't actually from this world but is from a fantasy realm and the lying friend is the one who is keeping the person there. The more and more the person looks into it, the more and more they realize just how out of place they are in the real world and a magical individual appears to attempt to take the power person back to their original world.[/hider]

[hider=Death doesn't always hold the answers.]"You stumble across an article online with the details of a brutal murder. There are pictures of the victim. It's you." 

The person who finds themselves murdered is actually dead and the only person who can see the dead individual is the police officer in charge of the case and now together, alive and dead, they have to solve the murder in order for the dead individual to pass on.[/hider]