We've seen the Clown Prince of Crime bothered the Man of Steel over the years, but in two of the most toughest alternate realities we've seen that their fighting have negative effects on the Man of Steel leaving the Dark Knight on either the outside looking in and/or a partial component to the Man of Steel's Loss.

Which brings me to my question DC fans: What do you think of the Joker's and his attacks on Superman and his effect he has on the Man of Steel ?

Plus when the Joker goes too far, like in InJustice and/or Kingdom Come, it makes me beg the question of Batman and his own part to play in all of this given how much of a control freak he can be and just how much he knows of the Joker and his attacks. What happens when enough is enough ?