Nothing extra terrestrial. Things like Yetis, Chupacabras and Drop Bears. I guess this could include supernatural stuff as well (but not ghosts).

Wow, a lot of "Do you believe in x" threads going on here.
My answer to your question is no. I think that people believe in these monsters only because of mass hysteria.

How narrow-minded. The only reason, huh?

I don't believe in Bigfoot because it's just not plausible anymore. 200 years ago, then sure. Not impossible to think, seeing as Murrica was a big wilderness except for the populated north-eastern coast.

Chupacabras... There is a LOT of evidence that suggests that it is a cross-breed of a coyote and a dog/wolf. Nothing more.

Sea monsters... I'm certain of their existence. We know virtually nothing about the oceans compared to the rest of the world.

do you believe in life after love!

As for the OP, no not really I just haven't seen the evidence.