Have you experienced, or heard of this?
It's an urge to do something you never ever would, such as stepping in front of a car, or shouting at an inappropriate time, or anything, really.
Apparently its named after something in an Edgar Allan Poe writing.
I often have the impulse to pull the hair of whoever is sitting in front of me on the bus
Estranged Son and Future Granddaughter
To think that London, or anywhere else for that matter, does not belong to any one demographic