Facepalm: Greg Hardy decides to make a 9/11 joke

Humor is a tricky thing.

Dallas Cowboys defensive end Greg Hardy -- already a lightning rod for criticism -- made things worse on Friday when he took to social media and made a joke that involved the 9/11 terrorist attacks.

It started with a Panthers fan tweeting out an image of the team's receiving corps that includes second-year wideout Kelvin Benjamin and rookie Devin Funchess -- who was taken in the second round of the 2015 NFL Draft on Friday.

That's when Hardy responded with: