Zeuxis
Laughed himself to death in 5th Century BCE
Zeuxis was a painter who was commissioned by an elderly woman to paint a figure of Aphrodite. The woman, however, wanted to model for the Goddess of Love herself. Zeuxis did as he was asked, and found the portrait so funny that he laughed himself to death.
There is a video of this on YouTube (honest). You can tell he was afraid to jump, but his handlers kept telling him it was too late to back out.
So all the way down, when he knew he was going to die, at least he had the satisfaction of being able to yell "I told you so!"