MONTREAL - A crowd infuriated by the last-minute cancellation of a
punk rock concert tore through downtown Montreal, overturning cars and
smashing into shops, police said Wednesday. Five people were injured. 

"The event surprised us, by its magnitude and the speed with which it
happened," Surprenant said. At least 42 cars and 11 shops were
damaged. 

Some 1,000 people were waiting for the concert to begin when told at
about 7:30 p.m. that the performers bands named The Exploited and
Total Chaos were delayed at the U.S. border, witnesses said.

______________
Conclusion:
Don't force them to learn about UFO and Alien Sci/Fi  stuff.

http://story.news.yahoo.com/news?tmpl=story&u=/031015/481/xryr10410151352