This, and the fact that they overload their food with ketchup, mustard and other condiments, without actually trying the food first to check for the real flavour of a dish or snack (e.g., how does a sausage taste without the condiment first without drowning it in ketchup or mustard).

To clarify, I worked with plenty of Americans when living in Spain, and this is what I observed, and what I have seen whilst dating them too.

Then again, some Aussies love doing this too. I just find it lame, but each to their own, of course.