Back in the day, it would have been goatse.cx
@TheLancashireman I think there is still a Spanish version live...hmmmm
but malware that might crash their system is still preferable
Reminds me:
Some years ago they started the project "Gaffen tötet!" (= "Gawking kills!"), fixing big QR-codes on the side of some ambulances of a service here in Germany when people began taking snaps of paramedics, hindering help.