disclamer : i dont own inside out , pixar does.
in the movie , joy and sadness travel around riley's mind world to return her core memories back to headquarters , in the end , the return the core memories back , sadness redeems herself and everything is happy... but nobody asks about how joy's sanity fairs during and or after the movie. your problably wondering , why joy ? well , when you look back she goes trough alot during the adventure , from the personality island collapsing to bing bong dying in front of her eyes , macking joy a lickely candidate to insanity , the only reason why i dont write it myself is because i lack the writing skills to write a good story , thats why im uploading this. so you can do what ever you want with it ( it dosnt have to have gore or viollence , it can be a paroidy if you want , just make joy ether go insane or question her sanity ) sorry if my typing sucks , i dont have ether the time or autocorrect