The US anthem is very difficult to sing and has an awkward melody. It's based on the melody of a drinking song. I dislike having to sing it, as I am practically tone deaf and it is not an easy song to sing.
Our national anthem (Sweden), well, people know the first part, "You old, you free, you mountainous North, you silent and joyful beauty, I salute you, the fairest country upon Earth; your sun, your sky, and your green meadows!".
The part people forget is: "Your throne is of memories from proud and ancient days, when honoured your name flew across the Earth, I know that you are and will remain what you were, yes I want to live and die in the North!" Oddly, not once is the word Sweden mentioned, just a vague North.
The mischievous children's version is "You old, you ugly, you ridicuolously fat cow, you eat only chips and Coca-Cola...".