Main drive belt on my Polaris ranger side by side.
Was heading in at 4:00 AM climbing the mother of all hills where I would normally hide it and then hike up the ridge to my elk spot. Half way up the hill it started making noises and jerking. Got it to within a 1/4 mile of the area of hiding, and it gave up the ghost. I sat there hoping another hunter would be in the area on this day, arguing with myself, "should I go in and hunt, or stay and wait for a person to get me out". My camp was over 10 miles away and I had no excitement thinking of walking back.
Then I thought, "why ruin someone elses hunt having to haul me back to camp, go hunt you idiot".
So I did. After 2 hrs of legal hunting I heard a faint sound of a vehicle in the distance. Aha Road Hunters. I have never ran so fast downhill at 11,000' ever in my life. It was over a mile and I was like Bruce Jenner, well the old Bruce Jenner- you know the dude kind.
They drove past before I could get to them, but miraculously they pulled over to take a leak. My 2nd wind kicked in and I bolted to them. They were in a Ford F150- couldn't believe it- this was a UTV trail. But hey I was grateful. They towed me to camp, and we have been friends for the past 3 years. I even gave them location of 2 of my deer tree stand spots and we seek each other out every year. I am a local and they are out of towners wanting intel on elk and deer.
Sorry for the novel, but that's all that has failed me that actually caused an end or a 2 day delay to my hunting