Domino Revelation

Imagine that one day you find out you belong to a family of witches on your mother's side, when you once thought witches were only fictional. Only a few days later you meet ghosts who need your help. Trying to solve their problem, you run into a vampire who wants your blood for his own unique magics. All of you team up with a demon who wants to prove he got a bad rap, and magic happens around you on a regular basis. Suddenly your best friend tells you she's an animal-shifter, and you also find out that your neighbors are a half-angel and a wizard.

Such a story Arc features Domino Revelation: The protagonist gradually finds out that several myths are true, and that instead of living in a "normal" world, she lives in a Fantasy Kitchen Sink. When each discovery leads to the next, the process resembles the knocking over of dominoes, hence the name. This trope is often invoked in Urban Fantasy, but may also be found in Magic Realism settings.

Often leads to All Myths Are True. May overlap with The Masquerade where only a select few can know, and The Unmasqued World, where the rest of the world knows about the myths being true. May also cross over with The Masquerade Will Kill Your Dating Life, Killed to Uphold The Masquerade, and The Not Secret.

Comics

 * Beasts of Burden: Vampires, zombies, ghosts, and other things show up.
 * Werewolf By Night: Werewolves aren't the only supernatural thing out there, weretigers, vampire, demons, and other superheroes!

Literature

 * Cal Leandros: Fairies called the Auphe are first introduced followed by a revelation of hidden monsters on the world amongst humans.
 * Jane Yellowrock: The main hereon is a skin-walker, she fights vampires and has a witch for a best friend.
 * Mercy Thompson: in this series we meet werewolves, vampires, and witches right off the bat followed by ghosts, demons, and eventually shamans and mages of ill repute.
 * Harry Potter: Witches and wizards, giants, dragons, giant magic spiders... the list is a little long for this series.
 * Kitty Norville: Well same thing we meet werewolves first, then learn of vampires, werepanthers, magic users, psychics, and other types of the supernatural ilk.
 * The Hollows: Witches and vampires exist, so why not ghosts, demons, and other such creatures?
 * The Otherworld: the woman of the other world are all sorts of supernatural types. We have witches, werewolves, nercourgists, half-demons, and angels. Of course this trope is in full effect.
 * The Sookie Stackhouse Mysteries: After the vampires have their coming out party we meet shifters, werewolves, weretigers, fairies, and several other supernaturals.
 * Soul Screamers: If the fact the main character is a banshee isn't enough, there are reapers, angels, and demons all hell bent on human souls.
 * Twilight: First come the vampires. Then come the werewolves.
 * Percy Jackson and The Olympians: Satyrs, the Minotaur, Greek gods, centaurs, nymphs... Again, the list is rather long.

Live Action TV

 * Charmed: First we learn of witches and demons, then angels, spirits, fairies, and a whole mess of critters come crawling/teleporting/orbing/shimmering out of the woodwork.
 * Fringe: Similar to The X-Files with aliens, mind control, and other weird things being revealed.
 * Lost Girl: All supernatural creatures exist, some are True Fae others just call themselves fae and are in fact Succubi, Spirits, Werewolves, and all manner of other magical creatures.
 * Supernatural: Dean and Sam are hunters. They fight demons, astral creations, angry angels, pagan gods, ghosts, etc.
 * The X-Files: Earliest TV example of this trope; from Monster of the Week to aliens in the basement with werewolves, wild men, demonic beings, and eventually Body Horror and evil spirits... this series had it all.
 * True Blood: Vampires first, shapeshifters, then goddesses, werewolves, fae, werepanthers, and witches.
 * Vampire Diaries: Again vampires first then we learn that witches and werewolves also exist.
 * My Babysitters a Vampire: The main characters have a babysitter that is a vampire. They also find out that one of them can see the future and that witches exist.

Video Games

 * Persona: Well, it's more Fantasy Kitchen Sink at times. Spirits (demons in Japanese) exist, but that's merely the catch-all term for supernaturals. And they ALL are very real projections of one's psyche.
 * Shin Megami Tensei I: Angels, demons, and god....yes its all real.