Know your meme...

"Jack Nicholson was not impressed with this joker..."

While very funny when you see it on its own, this picture has a backstory that may change your mind:

Jack Nicholson walked out of the Wolseley Restaurant in London on the night of January 22nd, 2008 when paparazzi informed him of the death of Heath Ledger. They told him it was a drug overdose which prompted Jack to say “That’s awful. I warned him.” Then somebody shoved a Joker photo in his face for him to sign.

And that is just beyond bad taste.