What's actually in your rig's "go bag" for roadside issues?

Curious what everyone actually carries versus what they meant to buy and never did. Mine's built around the calls I get most: a decent multimeter, assorted fuses for both 12V and any inverter-side breakers, a few feet of appropriately-gauged wire and crimp connectors, dielectric grease, and a tire plug kit.

What's in yours, and what have you actually had to use on the road (versus what's just taking up space)?