I keep a 4" pocket knife in my cup holder but I only keep that in there in case I need to cut through a seat belt or break a window (or everyday pocket knife stuff lol). It's much smarter to just give your assailant what they want (or flee in the car that you're apparently in) than to try and chase them down with a hand weapon, if you don't mind me saying. Unless my life is being threatened, it isn't worth it anyway. If a guy has big enough balls to attack you while you're sitting in a car, then he's probably got a gun, and I'm not going to bring a knife to a gun fight.
2014 V6 Base Coupe, Sterling Gray Metallic///3.31 Gears///FP6 Appearance Package///Tech. Package///Reverse Sensing and Security Package///Mods: Boss 302 grille, MMD Ducktail Spoiler, Weathertech Floor Mats, Bassani Axle-Back Exhaust