You may know the rumor about Phantom Cats or Mystery Big Cats, strange sightings of large felines all over the world that look like panthers or lions in the most unlikely places. Often in Great Britain but also Germany.
https://en.wikipedia.org/wiki/Phantom_cat

Well, early in the morning I was looking out of the window and saw a movement under the dense trees bordering the neighbor garden about 50m away. First thought it was a bird but it was bigger. I only saw small parts but it looked more like a fox but didn't move like one. After observing it for a while I went outside to chase it. You can guess whose idea that was though Alice was a bit conflicted. Don't wanna get bitten by a rabid fox either. Anyway, following the animal through the dense bush it turned out to be - a cat. Slightly European wild cat tier, not even exceptionally large. Clearly a normal house cat. It was highly focused and didn't notice me at all and jumped out of surprise when it saw me as I got about 2m close. Then ran away.

That was baffling. I had grossly misjudged the animal's size from the distance. Humans suck at estimating the size of far away objects, even with reference points. I imagined that animal would be at least 3 times bigger than it actually was. Guess that's how many Big Cat mysteries start. Well, it's not the first time, I know of such glitches from imposing tupper in some distance which often results in hilariously wrong sizes.

I did see another mysterious animal on the streets at night some years ago that likely was a Golden Jackal. Didn't look like a fox, more like a cross between a fox and a wolf. Alice chased it but it was too fast.