A group was touring London, marveling at the historic buildings, art collections, and such. The group included people from many countries. During the tour of the Tower of London, a man from Prague and another man from Athens struck up a conversation about some point in history.
A small disagreement ensued, which rapidly became a large one. They decided to settle the matter then and there using the historical accouterments at hand. Donning armor and chain mail, they prepared for a battle to the death. This attracted the attention of the rest of the tour group, who crowded around for a better look. Inasmuch as the combatants were in period dress, the people couldn't tell one from another.
"Is that the Czech wearing the armor?" asked one tourist. "No," replied another, "The Greek is in the armor. The Czech is in the mail."