Later, at Detroit airport, the tiniest thing - in a cafe, a man saw another customer's suit-bag flop onto the ground at a nearby table, into the path of oncoming travellers and their wheelie bags.

BBC: The selfless America outsiders don't see

In the latest case, Nepalese police say a man thought to be in his 20s set himself alight at a cafe near Boudhanath Stupa in the capital, Kathmandu.

BBC: Tibetan man sets himself on fire in Nepal