Well, the stick would certainly catch fire at the temps required to melt glass...you city types! ;-)
The glass cracks more often than not when cooling as there is no moderation of temps. But sometimes you can get lucky and lay a beer or wine bottle on a bed of hot flat coals and get something interesting.
I've seen some interesting ones, too.
And watch who you're calling "city type"! Chances are, I live in a smaller town than yours.