well... OK... if you are tempted to try to get a middle finger flash on purposes for a extended times just for the fun of it while in Berlin... now the local police may get the order to look out for you.... if they manage to get your registration no. they may even try to set up a "warrant of apprehension" at the border's... (but you know there are no borders any more)...
"I don't want to support you doing anything stupid right"
I know about a case where a Swiss guy done exact that, erecting his middle finger at any given traffic light a few years ago in a car.... well he got fined at the border and banned for live entering German territory... (bad luck.. he was driving i his car with a registration no. on the front)

now just to clarify the situation about the cops.
the police is mainly targeting criminal action in any kind as we all know...

but the local offences like traffic lights and rude parking lays in the hand of the local community warrants and office, managed by the council, means the office for safety, descend behaver and health.... the police only get called in for help as a enforced power if needed.
any way the individual police squaddy will take action if they notice wrong behaver of a civilian anywhere noticed, like hiding in the bushes behind a traffic light and waiting spider like for victims....

anyway have fun... hope you are a good one hand rider....
spooky

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The trouble is that he was talking in philosophy, but they were listening in gibberish.