[BrandoElFollito]

When was that, out of curiosity? I seem to remember that the structure of the windshields (at least in Europe) change in the 70's from ones that would break with a crack, to the ones that would shatter in plenty of small pieces (due to the internal tension, and at least two layers)

[prerok]

I saw that in the 90s but people were definitely doing it in the 70s as well. I am not aware of any stories of cracks or shattered windscreens because of it, though I am sure that if you do that with boiling water and not-so-frozen windscreen often enough, you would get that result :)

[johnatwork]

Maybe they meant hot from the tap and not boiling, which will certainly crack the windshield.