Headcanon that Greece will randomly start dancing the Sirtaki at any given moment, either to make things more fun while moving from place to place or just because he's bored at a meeting and wants something to do.
He'll grab other nations and drag them into it if he can. The energetic, easily distractible nations (e.g. America, Spain, Italy) are always easy targets.
Watching certain nations dance around, of course, draws the attention of even more nations, and then nobody can focus.
England always becomes distracted by whatever America is doing, many others watch in confusion or amusement, and Germany is easily exasperated by these shenanigans. Even more so when Prussia decides to join in.
It's been three years since the end of Unus Annus and I still don't really know how to feel about it. It's like there should still be videos uploading but there's not even a trace of the channel left outside of memories, which... I guess was the point? Anyways I don't upload stuff often but I did a little speed paint of this over here if you wanna see it.