There's some great stories here and some of y'all have way more interesting jobs than me. The stories that I can recall are not quite pointless but certainly examples of inefficiency, near misses and a lot of effort for not much return.
I was involved with a certain underwater vessel project in Northern France and was groomed to be ready to head over without much notice to perform my task. So I got the call and was given a whY ticket to a flight leaving in 48hrs. Of course, when I arrived on site, they were not ready for me and wouldn't be for at least a week. It ended up being 10 days and I passed the time exploring Mont St Michel, Bayeux and some other towns in the region. My work took one day. I then had to wait a few more days so I could transfer back to Paris, and ultimately home, with my new favourite friends who had been the ones to hold me up.