Slovakexit.
(Everybody forgets Slovakia)
The EU has been constantly slamming Poland for not changing the national currency unit Zloty into the shared Euro so far.
In the Entrance Treaty, Poland agreed to do it in the next millennium, when the economy allows that fact.
So, being constantly pushed about it by the EU commission, Poland has specified the acceptance of taking Euro for 2999.
The promised in the Treaty “millennium” still remains “millennium”, but I don’t thing they are all happy about the Polish response (LOL)