I don't believe a word of it, personally. Hailstones come out of the sky, not out of the U-bend. Filthy Austrians and their dirty tricks. And, yes, I tried to make the headline as vulgar as possible, because let's face it, it's what we are all thinking.
Hailstones Blast Man off the Shitter - oh god, poor man, all he wanted was a crap, and then he got iced up the arse by some Fortean weather. Pictures here.