My older sister thinks she's so pretty. i told her that no matter how much time she spends looking in the mirror, her face will always look just like her rear end

Its a good thing your sister is happy with her appearence. most girls have insecurities that can last a life time and sometimes mean comments like this are what make people think the only way out is killing themselves. congrats though, on voicing your useless opinion on here. we all needed to see that.