Wormholes exist...

[Rocketman]

I swapped the starter out on a Ford car I had once.  I dropped one of the mounting bolts, and it never hit the ground.  I had a spare bolt, so after I looked and couldn't find it, I put in the spare.  Two days later, the next time I drove it, at 0500, while I was still half asleep, as I got up to freeway speeds, I heard a clunk in the engine area, a clunk under my seat, and then a clunk in the trunk area.  I convinced my half-asleep brain that the starter had just fallen out.
I pulled over, and hit the starter, and the grinding noise convinced me there was something horribly wrong.  It took a few minutes to wake up enough to realize that it was the bolt making the clunk, and if you neglect to shut off the engine before you hit the starter, it tends to make a funny noise.

I just hope nobody hit that bolt and took any damage from it.

Mark

PS:  I made a stronger effort to wake up before driving after that.  This incident scared me based on the lack of cognitive skills that I had at the time.

[Jeff K]

One of the guys I worked with had his snapon pry bar "stolen" from him. He was pissed and bitched about it for a couple of months. Until the car he had been working on that day came in for more service, and then VIOLA there was his pry bar laying on top of the motor!

[Jeff K]

My best story is the time we went water skiing on the Mississippi river. While getting into the boat I dropped my brand new sun glasses into the river. We looked and looked, we could not find them. I was pissed. We went skiing for the day, and at the end of the day we beached the boat and when I jumped out I felt something under my foot... yep, my sunglasses. 

[bigguy]

I was pulling my sailboat many years ago. This was a vacation trip and I was traveling overnight trying to get to the gulf by morning. About 3:00 am I suddenly felt a violent jerk and heard a hideous grinding noise coming from behind me as I noticed my trailer wheel pass me.
I looked like a comet as I dragged the boat and trailer down the road.
I pulled off to the side and discovered that the entire wheel had come off as well as the axle on that side. We pulled out the sleeping  bags, I set a lamp in the cockpit and we spent the night in the ditch.
The next morning me, my wife, and the kids scoured the road on both side for more that a mile both in front of and behind where we lost the wheel. We searched for hours. Never did find it.

[The Anvil]

Here's another one; you put away a few strings of Christmas light in January that were working just fine when you took them off the the tree 11 months ago but when you plug them in after unpacking them they're dead as Jim Morrison. WTF???