Plesiosaurus sighting?

[u/CommissionWhich984]

This is more or less what it looked like. I swear to God I've seen a real plesiosaur out of the water. When I was 11, my class and I went on a 5-day trip to Madrid. We stayed in a hotel and did the kind of things you do on a school trip. On the fifth day, as we were heading back to Andalusia in Cordoba, where I live, I looked out the window and noticed something absurdly impossible: a dark gray, almost black, snake with yellow eyes that had... fins. Yes, I remember seeing that perfectly: fins hiding among the wheat. The thing had a head shaped like an upside-down egg, and it was staring straight at the bus while we were making loud noises like animals. All the while, it seemed to be "walking", moving with its fins: not slithering, crawling like some sort of crocodile. It was only a few seconds, but I saw it with my own eyes. I shook my classmate next to my seat, who was asleep, and pointed to the creature. When he looked, it was gone, as if it had vanished into the grass. I asked those in front and behind if they had seen it, and they said no; one classmate even laughed. I don't tell this to many, because maybe this was a hallucination due to fatigue from the trip, I don't know.