I do that all the time... Light cigarettes with my contact ball, that is. I've not burned anything down, yet.
I also found that the acrylic balls will melt when left in the sun long enough, too... And they burn sock poi, and melt the plastic covering of those cheap, nasty chairs you get in uni accommodation...
Also, head stalls in the sun REALLY hurt. so does stalling the ball anywhere in the sun for that matter...
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Empty your mind. Be formless, Shapeless, like Water.
Put Water into a cup, it becomes the cup, put water into a bottle, it becomes the bottle, put water into a teapot, it becomes the teapot.
Water can flow, or it can Crash.
Be Water My Friend.