"The man was summoned by his wife to deal with a spider ... Not being able
to reach it, the man decided to kill it by spraying it with the can.

"However he was unable to see whether it was dead ... At this point he
turned to a cigarette lighter to illuminate the room, but in the process
ignited the gas fumes and caused an explosion.

"The blast was so strong it blew the man off his feet and lifted the loft
door off its hinges."

http://www.telegraph.co.uk/news/news...-a-spider.html