We had a similar incident about 1.5 years ago...was hosting a get-together and during one of the fun-time games we were playing (having to identify notable celebs/headline grabbers, etc.), one of the ladies did not know who Tipper Gore was. At first I thought she was kind of putting on an act, but then realized she was being sincere. I was somewhat taken aback by this, needless to say.
If it weren't for FR I might be a clueless of current events.