I have seen something in the sky (that I thought was a satellite) turn 90 degrees and go on in that direction.

I saw a duck steal a woman's wallet.

It was hanging around her feet while she ate lunch, obviously hoping for some crumbs. She ignored it and it started poking its beak through her handbag. I saw it come up with the wallet, then start to waddle slowly away as she stood and took up her bag to walk off. The exterior doors on that side of the building were locked, so I couldn't get her attention to let her know what was going on. I wonder what she thinks happened to her wallet?

I was sitting at a red light once, when a motorcycle sailed through the intersection doing about 50 mph/80 km, with the leather-clad rider fucking t-posing on top of it. Just standing fully upright on the seat, no contact with the handlebars. Hell if I know how they were steering, but I didn't hear a crash.

As a bonus, the most darkly comedic thing i ever saw in person was up on a notoriously dangerous local mountain highway. As I was coming down, I rounded a bend and saw a white charger crashed into the barrier coming the opposite direction, facing me. The car itself was in pretty okay shape, but I guess they hadn't been strapped in because there was a huge, person-sized hole in the driver's side windshield. Beyond the barrier it must have been a hundred foot drop, and there was a local sheriff with one foot planted up on the berm, looking down over the edge. His hat was in his hand, his elbow was resting on his knee, and he just had this demeanor of "well, shit.". I only had two or three seconds to process all of this before I passed it, but I remember it clearly as the most morbidly looney tunes image I've ever seen in front of me.

I saw the moon move in the sky!

I was maybe 10 or 11ish? Standing outside on the driveway with friends. I was looking up at the big full moon. From my point of view, the moon was a few feet (relatively speaking) from the top of this big tree in my neighborhood. While staring up at the moon, suddenly its position shifted a few more feet away from the tree, towards the opposite horizon. I sort of had the feeling of vertigo for a moment, and no one else saw it. But the moon was still in the new position...

Space shuttle launches. I've seen basically every one that's happened in my lifetime since I grew up like 30 miles from Cape Canaveral, we'd watch the initial launch on TV then run outside to watch the shuttle rise over the trees in the yard. The solid rocket boosters glow and you could see them separate and fall back down.

The first time I drove out to the coast to watch as an adult my friend and I were sitting along the intracoastal and some dolphins came up to say hi while we were waiting.

I watched a total solar eclipse. It was really cool. I can’t imagine being some ancient tribesman experiencing that, not having a clue what was happening.

I have two:

1. Waves glowing with bioluminescence during a red tide. We didn't know it would be going on and were just camping by the beach. Walking on it at night, we all saw the waves glowing and weren't sure it was real. As we got closer, our footsteps in the area where the waves were rolling in and out were glowing as well. Just surreal.
2. A house blowing up. Guy opened a natural gas valve in the house and touched it off. Insulation shot way up in the air and the house itself bowed outwards in basically every direction, stayed standing though. At least until it burned down.

Seeing a massive cumulonimbus cloud structure from a plane. The diagrams in university don't do it justice.

Seeing pristine mountains and fields and packs of horses running in Patagonia. The beauty literally brought tears to my eyes.

I once saw the moon rise in Italy which was five times its usual size… people were gawking at it as if it was the second coming of Jesus H. Christ, hot damn.

Rolling hills - or rather - mountains, of pure snow reflecting the sunlight, where it was all white and it seemed like an alien landscape, where I had landed somewhere not present on earth

An art exhibit in Brisbane, the artist used a bunch of plastic sheets that were slightly tinted, but when you looked at the sheets through other plastic sheets, they were vibrantly brilliant colour.