Sorry, Sean Penn. Forget Jeff Spicoli in “Fast Times at Ridgemont High.” Brad Pitt played the DEFINITIVE stoner in “True Romance” as Floyd.   Pitt absolutely NAILS the lethargic hang-out-on-the-couch-all-day mentality of a chronic pothead. I don’t ever remember laughing so hard during a film than the moment when Brad Pitt asks the mobsters if they want to smoke a bowl.  It was even more hysterically funny than the infamous scene between Christopher Walken and Dennis Hopper.