This is not for the faint of heart.
Calvin Johnson's finger hasn't bent normally since 2013. After the Lions receiver suffered an injury and then wore a split in order to keep it straight. Johnson felt it was time to share his finger, and part of the surgery, with the world.
(Warning: It's VERY gruesome)
Johnson said he posted the picture after seeing an Instagram photo of former Panthers cornerback Charles Tillman's damaged finger. The formal rivals are still trying to outdo each other.
No one really wins here.