The most dangerous thing?

Did you know that small pools and bath tubs only need to have 1/2 inch of water for a child to be able to drown? Do you know how many children are seriously hurt in back yard pools? Do you have any idea of how many people are injured on trampolines each year? Serious injury and death can result from such simple things...
It is with great humility that I present what I believe to be the most dangerous thing ever constructed in a back yard. . . (small pics get bigger with a simple click)

Now...
if I could only figure out how to include sharks, a zip line and some sort of particle accelerator...