Interesting EU citizen in Finland?

[Bony]

viewtopic.php?f=2&t=30201

So here is someone who staying in Finland more than 3 months without register in the police office,
the reason is no border in EU countries.
The question is,
how about a EU citizen never lived in EU countries before, but parents have EU citizenship, so the EU citizen has a EU passport and one day landed on Finland, the border should have the entry record, so what will happen?:lol:

[Pursuivant]

Well, you are supposed to. What will happen? Nothing. If nothing happens. If something happens, well, tourist, no insurance, they will have some challenge where to send the bill maybe.