You should also FEAR the Canadian symbol of the sovereignty the beaver! Those little guys are not so little fellows can bite!
Canada's head monarch The Queen should be feared. She has a pack of corgi's that will rip you to threads should you insult her or any of the countries that she reigns over.
One should fear not being able to communicate with a vast number of Canadian's even if you happen to be fluent in English or French.
Fear being expected to go for sushi or dim sum for lunch fairly frequently.
Fear dog sled teams. The average dog sled team can kill and devour a grown human in less than three minutes.
Fear saying anything negative about the Canadian health care system. Any visitor who suggest its not a good system should expect to be asked to leave, have your face rubbed into the nearest snow bank or once its confirmed you did buy travel health insurance you may be hit on the head with a hockey stick.
American's should fear learning while in Canada how cool and cheap a place Cuba is to vacation and can expect to go home mad as hell that they cant join their new Canadian friends on their next winter vacation
Fear learning that having an Inuit carving by his bedside has proven to be good enough personal protect for Canada's Prime Minster so the rest of the country figures its good enough for them. Again visitors publicly expressing a different opinion should fear being asked to leave or being beaten by a hockey stick or have their face rubbed hard into the nearest snow bank or being fed to the sled dogs or a really big beaver!