Mine are all pretty standard:
- pull links from chain to make a geared into a singlespeed after a derailleur mechanical
- goofy cable tricks to fix a brake temporarily
- etc.
The best I ever saw was from a friend riding the Last Chance 1200k in Colorado. He broke his rear hub shell, and being that it was during a rando event, no outside assistance is allowed between control stops. He rode the remaining mileage (something like 35k) to the control with a couple of giant zip ties holding the crack from spreading across the entire hub. He got a replacement wheel delivered to the control.
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"I feel like my world was classier before I found cyclocross."
- Mandi M.