What to keep in the trunk for EMERGENCIES?

I dont really carry anything, unless it's going on a long trip. But, when I go to the track, I carry a full set of sockets, 1/2 and 3/8 drive, a full set of wrenches from 5/16 to 1", and a 1/4 drive wrachet with 11/32, 1/4, 7/16, and 1/2 " sockets for it, plus extensions. Also, vice grips, a set of linesmans pliers, a needle nose pliers, wire stripper/crimpers, electrical tape, a coil of 10Gage wire, some 14ga wire, a tube of black RTV, and some misc screw drivers, a deadblow hammer, and a roll of duct tape. I've also found a spare wire coat hanger, or a roll of mechanics' wire rather handy.