Simple Real or Fake answer to each of the following. God or Gods Aliens that Visit Earth Loch Ness Monster Bigfoot Abominable Snowman Illuminati Lizardmen Ghosts Psychics Britney Spear's Breasts
Most to least believable. BS breasts Illuminati Bigfoot/snowman Aliens God Psychics Ghosts Lizardmen Nessie
I'd put Nessie way above god, there's every chance that Nessie is just some drowned monitor lizard that's swollen up after 200 years of being pickled in Scottish waters.
Nessie dead last for me. A giant creature like that that has been systematically searched for in big funded expeditions using sonar and all sorts and failed to be found time and time again. And in a very limited area of existence. Definitely the most likely fake of the lot.
Also some could be combo's, as Tel has pointed out. Nessie could be a ghost. Aliens could be bigfoot and Lizardmen. God could be BS breasts. Psychics could even be Illuminati.