That was a good article. Titus Andronicus definitely marked an extreme example of Shakespearian gratuitous violence (The baked-into-a-pie-which-was-in-turn-served-to-the-mother deaths) and I must confess that this play has always been a favorite of mine.
However, I seem to remember that a couple of young Princes and heirs to the English throne were dunked headfirst into a barrel of water in Richard III. I did not see any dunked-into-a-barrel-filled-with-water deaths listed in the tabulation.
... and then there is the wonderful scene in Hamlet when young Hamlet (while traveling on the high seas) finds that Rosencrantz and Guildenstern are carrying instructions to the English court to have him executed. He deftly changed the written instructions so that they were instructed to execute Rosencrantz and Guildenstern instead. I forget the exact method of execution, but I always found it amusing to see their reaction when they figured out that they had been hoodwinked, and saw their future careers at the Danish court shortened a bit.