Hi PF, hope you're well mate. ... Don't know what you saw eh? ... i'm glad you posted this in a very reasonable sober manner instead of the plethora of hyped and often 'elaborated' statements [reports] that I have witnessed incessantly from fellow forum members on various sites over the years.
You briefly saw an out of place and unexpected optical sight and didn't know what you saw, but didn't go on to claim some kind of esoteric knowledge that it was in fact have been an UFO, Ghost-light or whatever else paranormal manifestation could account for this items description. ... And i'll go so far as to suggest that you might indeed never manage to find out for sure just what that unfamiliar object was. ... And I know that you are wise enough to just accept that 'such seemingly inexplicable things just happen with no rhyme or reason in an average lifetime'!
.... Which brings me to a 'tenuously-similar' thing that happened to my son and myself a few years ago. ....
It was roughly about this time of year about 8 or 9 years ago. It was definitely in the small hours [possibly about 2am-ish] on the A52 , just a couple of miles west of the village of 'Old Leake' ... it is a rural road that bends it's way through farmland and woodland for about 20 miles [or so] from Boston up to Skegness in Lincolnshire [on the east coast of England] ... the reason that me and my son [Jordon] was travelling that road at that time of night was because we had just dropped my oldest son off at Boston hospital with his daughter [2 years old Ivy my pet girl lol.] whom had had a bad fall and broken her arm/elbow badly ... [How?... that's another long story that can simply be answered as 'because she was a normal clumsy 2 year old that couldn't make it from one bunkbed to the other without falling after-all!] ... anyway, we were driving back from the hospital because Troy and Ivy had to stay the night, and being that it was a hardly-lit 16 miles of narrow bendy country-lanes to our cottage in Wainfleet, I was averaging about 30 mph and slowing down considerably for the sharper bends, it was a dry, warmish and pretty clear night . but being in the countryside visibility was mainly confined to where the headlights were pointed and the occasional farmhouse light. [and of course the odd on-coming car light ... but I only recall one or two of them all the way home?] ... and as I said it was while passing a mixture of crop fields and woodlands a couple of miles before reaching 'Old Leake' that we both saw [simultaneously] this ... weird looking sight! ... it was [or seemed to be] a detached lightbulb floating or flying about 8-10 ft from the ground ... going from slow to quite briskly in a zigzag pattern around this field that was about one square acre in size and near enough empty, barring a few scattered trees. Being surprised that 'a farmer' would be out working on a tractor in a dark field at that time made me slow to a stop at the side of the field [just to try and show Jordon that it must be the light on a vehicle in the field... because it was on his side of the car, his window was wide open and he was staring at it for some time and swore that there was no tractor as I had suggested!] ... it didn't take more than a few seconds before I decided to get out of the car and have a better look as due to the zigzag nature it was coming toward us.... I quickly jumped out and scuttled around the front of the car to the edge of the field where there was a skimpy wire fence that came up to my stomach. Jordon had gotten out as well and we both stood staring at this "perfectly round lightbulb' come to within about 25 yards from us... and yes! it was about 8-10 feet off the ground, but we could still see no tractor below it! ... nor could we hear any engine noise at all!!... the light then turned and continued it's zigzagging motion through that field away from us and we watched as it left the field and went into the neighbouring woods on the far side away from us [about 60-70 yards away] and we stood and watched it for a few minutes more intermittently flickering as it weaved it's zigzag motion even in a wooded area, and eventually it disappeared ... and for all I know, carried on into another field beyond that wooded area.
We eventually just scratched our heads in confusion and slipped back into the car and drove without anymore incident to Wainfleet. [giggling and puzzling all the way! [I said to Jordon ... "there's no way i'm ever mentioning this on my UFO sites!" lol]
The thing is that I had no idea what me and my son had witnessed on that night, and by the morning after I was trying to convince myself [and Jordon... but he wouldn't have it!] that there must have been a tractor under the light ... and that somehow we couldn't see the light shine on it! ... and that there must have been some atmospheric condition that I don't understand that obscured the noise of a seven ton diesel engine from us! ... and that there must have been a path through the woods! .... but I could never hold my face straight when I said this inside of my head!! ... and even now after all of these years , Neither me, nor Jordon can satisfactorily square this circle of conscious reality that we share. .... God knows what it was!
..... Believe it or not.... I have no proof, but I promise that this is a true story, and whenever anyone asks me if I have ever personally seen any UFOs [the extraterrestrial kind] or any ghosts or witnessed anything unequivocally-paranormal.... I always reply "not personally, no!"... but for the past 8 or 9 years, my mind always strays off to that field in Lincolnshire while i'm saying no! ????
Cheers Buddy.