Fire at the American Airlines Center in Dallas during a Rihanna concert. Using fire on stage is a very serious undertaking. Even the professionals have bad days. If your HS director wants to have even the simplist of candles on stage, advise them against it.

News story:

http://www.cnn.com/2011/SHOWBIZ/Music/07/09/rihanna.concert.fire/index.html

Youtube video: