Such a feat as acquiring an F- is not an easy gain, and the everyday slacker will just not do. To obtain such a legendary grade upon your classroom input, one must work hard and put in thousands upon thousands of samples of ignorance while simultaneously putting in time unworthy of class participation points such as the classic "A for effort".
In most cases, this grade is so beyond fail that it equals win.
person 2: *eats biscuit, vomits a little in mouth* wtf no, f-
person 1: LOL OMG why did the chicken cross the road????
person 2: wtf don't bother going on with that joke, f-