If you're happy and you know it, sing your national anthem really loud!
Sofia Goggia, women's downhill ski race gold medalist shows 'em how it's done! Not only does she know all the words and sing them loudly, but she also does the "pom pom pom" bit of every self-respecting national anthem. Fortunately for her it has a jollier tune and much cooler words than God Save the Queen*, not least that the shout of Si! appears to be official.
*Surely a dirge that ranks high in the list of the world's most terrible national anthems, both for music and lyrics.