I once had a coworker who was from Switzerland, and his wife was from Lichtenstein. They told me their dialects are so different, that there are words and const

I once had a coworker who was from Switzerland, and his wife was from Lichtenstein. They told me their dialects are so different, that there are words and constructs that they each use that the other doesn't understand, even after being married for 10+ years.