Strolling through a small city in Croatia a few years ago, we saw two Roman centurions walking down the street. We thought this was a little weird, so we started following them through the twisty, medieval streets. We lost them around a corner, congratulated ourselves on our awesome adventure, and stopped for some wine.
When we emerged from the wine bar and headed back to the city's Roman forum, though, there was a large crowd watching an entire procession of centurions (at least 50 of them), escorting some concubines and what had to be the Emperor into the square. Then the Emperor started addressing the crowd--unfortunately, in Croatian, which we didn't even remotely understand.
We had absolutely no idea what was going on. Obviously, it was a play of some kind (or, I guess, we'd time-travelled somehow, along with the rest of the population of the city), but no one could explain it to us. If anyone here knows why there would be centurions and an emperor roaming around Zadar on a summer night, I'd love to hear.