I love to make fun of my girlfriend for being Mexican.
Me and her and our friends were all packed in a car, so badly that she had to sit on my lap and I was like "Man, we're all packed in here like Mexicans", and a while later she was like "Gosh, there's so many people in this little car" and I was like "Shouldn't you be used to it?"
She thinks it's funny. I also make fun of her for being short. She knows I love her so it's okay.