Seeing that I'm quoted in the OP of this thread, I thought I could ad some more stories about historical (and general) ignorance, that I have experienced.

For example, one person with whom I had a conversation was convinced that it was actually Attila who crossed the alps with his elephants. Generally, I find that many of my compatriots are having a hard time knowing which of the two "Scourges of Rome" is which.

On another note, I've heard people think the carthaginians were moslems, that Megas Alexandros was Roman, and one history-teacher I spoke to had never heard of the Sassanids, claiming that the Achemenid empire was the only Persian Empire to become a major power.

However, one of the more stupid thing I've heard was when, while skiing in France, I overheard two countrymen of mine standing next to a church conversing thus:
-Are the French muslims or christians?
Whereupon the secound, after due consideration, answered:
-Neither, They're Catholics.

*Sigh*