It provokes a debate about Europe's role in sustainability.
While some protest that the question is unimportant, it still provokes strong feelings.
But much in the same way insurance coverage or subsidies for birth control are mocked or met with outrage, the idea of women even getting small tax breaks for menstrual products provokes incredulousness because some people lack an incredible amount of empathy... and because it has something to do with vaginas.
"There's contact," admitted the Atlético director Clemente Villaverde, "but I don't know who provokes it".
"We'll urgently look at a [public inquiry] because I certainly appreciate how serious this is, how this provokes very strong emotions, dismay, outrage amongst the victims' relatives and families, so we do want to make sure that we do everything to get to the bottom of exactly what did and didn't happen," the deputy prime minister said.
As for Tony Blair: whatever some people say about his record, especially on Iraq, he is simply not in the same league as Thatcher, or even Brown, as a leader who provokes an extreme response.
This is an elegant and clever moment where gender transcends class, and it provokes tears in the audience.
Kamerić's work, a mortuary fridge with a screen that flashes up random images from her search – around 30,000 photographs, documents, records, satellite images and hours of video, provokes a feeling not only of her unfolding mission but the vast scale of the crimes.
It's Mercury who provokes gasps when he appears on screen to "duet" with Lambert in a Bohemian Rhapsody so riotous one fears the venue may combust.
Pakistan is narrowly negative; only Nigeria provokes anything like the hostility we accord to people from Bulgaria and Romania.
Mr Obama will be incandescent if Israel provokes a war which he has said is not yet necessary, and on the eve of an election.
