I tend to work right at the edge of my work surface. Both of these have happened to me more than once:
1: I drop a tiny part. First thing I do is slowly and carefully back my chair away from the work surface and look around on the floor. After all, I don't want to step on the part and break it. OK... I don't see it, so I carefully get on my hands and knees and search the entire floor. Once. Twice. A third time. Hmmm... still don't see it. Where could it have fallen???!!!
Finally I give up and resign myself to the fact that the part is lost forever and I'll have to scratchbuild a replacement. So I get up and sit myself down at my work surface again. And there's the part. I dropped it, but it never got to the floor! I dropped it onto my cutting surface and it was there the whole time!
2: Similar story... but this time the part is actually in the fold of my pants or shirt!
And in a similar vein... I've dropped a part, searched the floor over and over again, given up and actually scratchbuilt a replacement... then several days later when I've dropped another small part I see the original part I dropped days before right there on the floor. I can't explain it. I can only say it's a true story!