Here's reasons no. 1, 2 and 3 for never ever cleaning cobwebs off your house with a blowtorch:
Authorities said Galen Winchell set fire to his home on Smith Road in Sargent around 11:30 a.m. Wednesday as he cleaned cobwebs from exterior eaves with a blowtorch. Winchell noticed the blaze when he saw smoke pouring from the attic.
http://www.cbs46.com/news/17919628/detail.html?taf=lnta#- - Thanks t!