Stumbling through the web I've found this video, taken October 25th in Georgia, of an epic hailstorm hammering a backyard with tennis-ball sized hail hitting the pool just like cannonballs. Unbelievable.
If that was not enough in the following video, taken in Woodson, Texas, the hail is probably even bigger, like an angry god trying to lapidate the whole mankind... take a look at the damages in the second part of the video:
Finally, a third video from Melbourne. Here the hail size is less impressive but wait just a minute or so and you'll see how the hailstorm suddenly triggers a flash-flooding transforming a street in a river (and an angry one):