There were no suicides associated with the 1987 Black Monday crash. You're thinking of Black Tuesday in 1929, a much bigger event. Even so, nobody jumped out any windows on Black Tuesday -- it was an urban legend. There were a handful of suicides but nothing statistically significant.
I hope that customers of MtGox don't do the same thing when they realize how much they've lost.
I also hope Karpeles doesn't harm himself, though we should have at least as much concern for the customers as we have for the proprietor.