OK, then "costume party" and not fancy dress!! Gotcha, fairy-britches!
Stay there anyway and make everyone feel realllll uncomfortable!! Act like I don't even notice!! That'll teach 'em to change at the last minute!
All your friends are raving about a given book so you finally break down and read it, only to find it full of extremely objectionable material and a political slant opposite yours.
A) you read it all and tell them you "enjoyed" it.
B) Throw it in the garbage and tell your friends you thought it was horrid.
c) Use the pages to wrap frozen halibut and tell your friends it was kinda "fishy" but you read it anyway...