Pokémon Go, the world-conquering augmented reality mobile game in which you traipse around (a real) town trying to find (imaginary) little monsters, finally launched in the UK last week. On its first weekend here it had quite an impact.
People have been catching them in towns and cities, in the countryside and even on top of local landmarks.
The British may have a reputation internationally for drunken violence, but this was the scene in one town centre at 1am on Friday night.
A London overground train station even blamed the game for delays (probably not entirely seriously).
But there have been serious incidents: On Friday night, a 15-year-old boy was arrested after three students allegedly had their phones stolen while looking for Pokémon in Hulme, an inner-city district of Manchester.
Derbyshire police said they spotted children playing the game near train tracks and reminded them of the dangers of 120mph trains.
Police in Hampshire spotted a car being driven erratically – and slowly enough for them to see what the driver was doing.
Police in southwest London had to issue a statement pointing out that the station in Twickenham is NOT a Pokéstop (i.e. a marker in the game where players can congregate).
The Pokémon craze found its way to Leven, in Fife, where the local police force had quite a sobering warning, written in the local vernacular.
And on the flipside, in Doncaster, police said Pokémon Go players actually managed to stop a crime. A group of Pokémon seekers saw a theft in progress and phoned the police, who arrived just in time to arrest the would-be thieves.
Meanwhile, some businesses are cashing in.
Predictably, pubs have got in on the act too.
And it's been a positive thing for this church in Birmingham, which spotted a marketing opportunity once it became a gym (where players fight each other in the game).
Stay safe, Pokéfans.
Patrick Smith is a senior reporter for BuzzFeed News and is based in London.