What can I say? [Screams in pain] Okay! Okay! I'm down to my last joke anyway... but this one'll kill ya!
Who: The Jester (Joker's Parallel Version)
Source: Justice League: Crisis on Two Earths
Note: After being brutally beaten by J'edd J'arkus (Martian Manhunter's Counterpart) and Angelique (Hawlgirl's Evil Version), he says these first words before Angelique stabs him if her flaming sword, then says his last words before detonating a small bomb, exploding the building's whole floor and killing him along with J'arkus and his henchwoman.