Laughing matter

Today on the tram there was a group of people in the back, laughing very heartily and very loud. At first everybody around them started to smile, 'cause it's kinda contagious. But when they kept on laughing on and on, it started to irritate me a bit. It was really quite loud. When I was exiting I was given a card about winning a holiday in Fribourg. Apparently it's a laugh to go there. Hmmm.