Seen various places, first from vampry:

when you see this, post a quote from Shakespeare on your journal.

I’ll tell thee what, prince; a college of witcrackers cannot flout me out of my humour. Dost thou think I care for a satire or an epigram? No; if a man will be beaten with brains, a’ shall wear nothing handsome about him. In brief, since I do purpose to marry, I will think nothing to any purpose that the world can say against it; and therefore never flout at me for what I have said against it, for man is a giddy thing, and this is my conclusion.
–Much Ado About Nothing