Samba magic

In a local mall was arranged a carnival today to cheer up people in the middle of this wet, dully grey, sleet filled spring. One of the most showy acts was a big samba parade dancing through the mall in the rhythm of live percussions. In the extras there is another shot of the dance acts. The group consisted of people of different ages from 20 to +70. It really cheer up the audience and rhythms took over some of the audience so much that they joined to dance with a parade. Common understanding is that Finns are very reserved, but I'm not sure about that as per this experience...and many other before....or is it just samba magic?