The most annoying historical myth I have ever encountered, is brought to us by the residents of the Great White North or Canada as some call it.
Now in my travels throughout the internet and a few times in real life, I have encountered some Canadians, who claim either in a sort of joking tease or as some sort of nasty counter to any point I'm trying to make, that Canadians burned the White House down. Its usually phases as "We burned the White House and we can do it again."
And it's just not true.
What they are referring to is the Burning of Washington during the War of 1812 and for some reason, Canadians (at least some of them) claim it as a victory. While the Canadian Militia fared well during the war, they had nothing to do with the Chesapeake campaign. The army under Major General Robert Ross, was comprised mostly of veteran regiments from Wellington's Peninsular Army, who had been shipped from Spain. The only "native" force with the British Army in the Chesapeake, was the Corps of Colonial Marines, which was raised in the Caribbean from former slaves.
The rest of the army;
The 85th Regiment of Foot "Bucks Volunteers"
The 4th "King's Own" Regiment of Foot
The 44th "East Essex" Regiment of Foot
The 21st "Royal North British Fusilier" Regiment of Foot
Detachments from the First and Second Royal Marines Battalions
Were all raised in England (or Scotland for the 21st).