The differences between the UK and the US/Canada are not really any worse than the regional variations within the US itself. I had a friend who was from New York City (the Bronx I believe). When he was a little kid, his family took a vacation trip to Maine. He went in a store in a small town and bought a bottle of Coke and some potato chips. The clerk put the chips in a paper bag, then turned to him and said "would you like your pop in the sack?". For a moment he thought she was inquiring if he was into father/son incest.