Hmm, one of the wierdest things I've ever seen in FH is THE FOOD CLUB! 8D. It started out with a potatoe then people started making more food and then we made a group. I'm one of the co-owners, Cup of Milk XD
I've also seen a Flying Treelion and a Rabid Duck (the Treelion was me, the Duck was my friend)
An Ice Cream Truck (I blew him up because he didnt have the ice cream I wanted e.e)
Several Slenderman characters, all of which I started calling Slenderbro (dont ask)
A dolphin in Bonfire (she was nice :3)
And I once organised a Minecraft danceline