Whats the name of this movie i think its called the legend of... (something)?

ok so it basically is this movie bout this guy(not sure his name so ill refer to him as jack) so jack is a nobody and gets dissed in a bar by this plumber dude and his buddy and then jack tells this other guy hes a hitman and pretends like hes going to kill the plumber dude but incedentally the buff plumber was coming home from a date after he had just eaten some bad oysters and dies and jack thinks he did it and makes everyone think he did at the end he robs a gas station and flees because he thought the cops were looking for him but of course they werent and he runs and eventually dies in the woods but everyone else thinks he survived and escaped and still believed he was the one who killed the guy... please god somebody help me i saw this movie and couldnt stop laughing and ive been searching for it for over 2 yrs now somebody plz help me...