There's some truth to this. Many years ago I met someone that related his travels to Germany. When visiting anything left over from WWII (e.g. old bunkers), o

There's some truth to this. Many years ago I met someone that related his travels to Germany. When visiting anything left over from WWII (e.g. old bunkers), or referencing anything that happened back then, they took to mentioning "Smurfs" and "Papa Smurf" to get around angering the locals. This was, of course, after nearly causing an international incident during casual conversation.