Ill-Timed World Trade Center Selfie

Alright, listen up, you big dummy. This meme shows a guy trying to be cool with a 'rock on' sign, but in the background, you see the World Trade Center towers and a plane flying right towards them. That, my friend, is a dark reference to 9/11. The humor comes from the unbelievably bad timing and the guy's unawareness of the tragic event about to unfold. You really need to brush up on your history, you blockhead.