Trail fix 1: Driving through San Francisco at night somewhere remote my BJ60's clutch died and I discovered that I'd run out of clutch fluid thanks to a really slow leak somewhere in the system that had taken probably years to empty it (not something I really check the level of, even if I could see through the grime). The solution was that Toyota fortunately used the exact same fluid for brakes as clutch (is this usually the case with vehicles?), so I was able to siphon out enough from the brake cylinder using a disassembled bic pen to keep going.
Trail fix 2: When I was a kid my dad's FJ60's fuel pump went. The fix was just to hold a 2L bottle full of fuel out the window and gravity feed fuel using some adapter hose taken from my toy squirt gun that KFC happened to be giving away that week. Middle of the desert in Australia, and the best bit was we passed another guy in a 60 going the other way holding a bottle out the window!
Trail fix 3: Blew a ball joint on a chevy camper van on a logging road somewhere remote BC. Repaired it with duct tape and rocks. This didn't work at all, and in retrospect was just a stupid idea. Hitch-hiked and came back the next day with a ball joint