Oh jeeze. I am probably going to resemble some of these remarks. Here's one that takes the chaosmagnet Ridiculousness Prize for Bulk and Weight:

My car emergency kit contains a pair of very large Channellock pliers...which I've used at the roadside to fix the hood latch of my car, another time to help pull part of my car off after a wreck so it wouldn't drag when I drove to the body shop, and for "emergency" riding toy repair at a friend's house.