Calling all you Deadpool fans! If you love the “Merc with a Mouth,” then you can file his latest outing under C, for “crazy enough to work,” or, better DP for “definitely plausible.” In the world of Deadpool, just like the ’80s, anything goes. So feast your eyes on the teaser trailer for Once Upon A Deadpool which takes all the hard-R elements out of this years’ Deadpool 2, and chops up the story a la the 1987 bedtime-story classic The Princess Bride, replete with an adult Fred Savage! Yep, like we said, crazy enough to work. Enjoy!! Once Upon A Deadpool opens in theaters for a limited engagement this holiday…