US citizens seem to often do so..
Unrelated, I once on a trip to the US met a group of motorcyclists on modern bikes and with proper, modern safety gear (at Grand canyon I believe). Having never seen this before in the US (outside sports bikers doing it as much as a clothing statement as for safety) I went over and said hi and said this was the first time I had seen this. "We are Canadians" they laughing replied.