I'm wondering, what's the best/silliest/most clever/stupid makeshift repair you've done on a vehicle to get it running when in a tight spot?

I'll start with something simple.

Was driving out the back of Bourke once (literally) on a 45 degree day in my old '71 HQ wagon. Engine was overheating, so I decided to pull the thermostat out (which I had already known was sticking, but was too lazy to replace when I should have ), and then the gasket disintegrated on the thermostat housing.

Made a cardboard gasket out of a weetbix box, and soaked it in oil (from the dipstick) to stop it going soggy. Not only got me back to Bourke, but survived the 13 hour drive back to Newcastle the following day.