This 1985 photo of Princess Diana dancing with John Travolta at a ball thrown by Ronald Reagan has always boggled me. In fact, if this photo didn't pre-date PhotoShop (and there wasn't a ton of video footage of them dancing), I'd suspect it was fake.
Yes, strangeness abounds with this particular photo. As a quick example, there's the whole "Why is John Travolta at a White House function?" thing. His career had pretty much flatlined by this time (until Look Who's Talking came out in 1989). Can you blame us, really? I mean, we were still recovering from Staying Alive for crying out loud!
Also, there's the whole celebrity/politics thing. Perhaps it's just an urban legend, but I'm pretty sure that the universe falls out of alignment if a celebrity attends any kind of Republican function.
And while many celebrities often feel that they are royalty, actual royalty (and most Kennedys) hold no such illusions. To see the Princess of Wales even in the same room with Danny Zuko is very strange.
In fact, there are so many strange things about this scenario, that it creates a near "when pigs fly" phenomena. If not for this photo, I might walk around saying: "I'll stop eating meat when Vinnie Barbarino dances with the Princess of Wales on the floor of the White House!"