You were sitting next to the USA, he was literally bragging to any country that you and him had the longest business friendship of all the countries.

"Me and Mexico have more than 200 years of friendship! No one can beat that" Usa boasted with a big smile, some were surprised by this, until Japan spoke

"Actually it's not like that, me and Mexico have 400 years of friendship"

Japan commented, a great silence quickly formed in the room, you just smile when you see how Usa seemed upset