Uxmal Spider:
I'll say this, normally I'm all about spiders. They are shy critters that eat the annoying bugs. So long as they're not radioactive 1950's era monsters, I am happy with most spiders.
But then there was the Tarantula in Uxmal. Not quite a monster, but verging on it.
I was walking towards my hotel room, and she paced me. I stopped, she stopped. I started walking, she followed. I swear to you that I got stalked by a spider.
Creeped me the heck out, Once I reached my hotel room I slammed the door and spent the night thinking of hairy legs and fangs.