Halloween is an American holiday
Halloween is strictly an American creation that continues to haunt expats abroad, although I did once attend a Halloween party themed, “Dress like a slutty American.” So yeah, while there are plenty of foreign fetes that hinge on themed dressing (hen parties, anyone?), I'm not sure there's another country where the people dedicate such an inordinate amount of time or money to planning costumes.
While we’re at it, so is St. Patrick’s Day
While St. Patrick’s Day may have its origins in Ireland, the sloppy traditions of mid-morning, green-beer guzzling are as American as the iPhone.
Airport security is like Gitmo
Fact: there are airports in other countries where you can saunter through security without so much as an ID, let alone a full body scan, copy of your dental records, and requirement that you turn over your first-born child.