Many times the only sign that you've neglected the proper maintenance of your vehicle is something important falling off, like a wheel. Jalopnik commenter Pres started off to work one morning only to have his wheel exit stage left shortly after takeoff and quickly make friends with a nearby bush. Thankfully, the only damage is a bent suspension bracket and some tweaked sheet metal. Remember kids, always keep those lug nuts torqued to spec. And knowing is half the battle.