Is there anything Canada isn't best at? I once heard a (bad) joke. If you are in Canada and hold the door for a group of 5 people you can expect 7 "thank you"s

Is there anything Canada isn't best at? I once heard a (bad) joke. If you are in Canada and hold the door for a group of 5 people you can expect 7 "thank you"s. Well that's just a joke I thought, there is no way people are polite anywhere. So I decided to act on this little limerick and compare it to Nebraska manners. At a few restaurants, in home town of Omaha, I tried holding the door for groups counting the "thank you"s. The first group of 5 gave me 6 "thank you"s. I thought that was actually pretty good, but it is not an experiment without a control. I had a friend going to Canada and asked him to try it. Sure enough the first group of 5 gave him 7 "thank you"s.