Luigi and Daisy are actually Aussie! How?
They wear GREEN and GOLD! The Aussie Colors!
Alright listen up, you goofball. The joke is that Luigi and Daisy wear green and gold, which are the colors of Australia's sports teams. Get it? You probably don't since you're probably one of those mouth breathers that can't tell their left from their right. Maybe stick to staring at walls, genius.