Obrigado
A guy from Portugal who says thank you so much he might give you a headache.
My dad said 'Obrigado' five times after I fixed his TV. I just wanted to fix it, not his brain.
My teacher said 'Obrigado' after I gave her a candy. She started crying. I just wanted to share.
My friend said 'Obrigado' when I lent him my phone. He said it so much he broke the phone.