As an American of Irish descent, I can tell you that we aren't exactly known for keeping cool heads and avoiding foul language. If you need an example, see this video.
In it the young man lies to his dad and tells him he failed his driving test again while secretly filming him from a phone.
What follows can only be described as the most Irish thing ever, complete with a ton of angry cursing and even some U2 playing in the background. It's probably NSFW, but it's hilarious.
Someone should put the dad in a rally car. I'd love to hear that.
Hat tip to Carscoops!