I don't know if anyoe has done this before, but I realised you can set things alight through glass, without damaging the glass.
I did it at Wang Cars. I used the flame thing (whatever its called) and aimed it at the window from outside. It didnt break the glass, however the cars inside blew up!!! Before the cars blew up there was no fire, so I wondered if it was caused by heat, rather than fire???