What to keep in the trunk for EMERGENCIES?

dont forget a ecu and a voltage regulator. i keep enough tools in my car to be able to pull the top end of my motor apart lol. its come in handy a few times. Some electrical connections - spade connectors, butt connectors - electrical tape, strip/cutters as well. maybe a couple bulbs - though it wouldn't be a emergency to change a bulb...but would be nice to just pop one in.