I've randomly spouted the flames as the pyro and got an invisible spy a few times.
That's basically all the pyro is good for.
No shut up. Pyros are like, my 2nd fave class!
That's not all pyros do. Good pyros at least...
W+A+D+M1
+M2+shotgun/flaregun(if you're lucky)+Axetinguisher(If you're REALLY lucky.)
I got the flare gun AND the axtinguisher, but I still havn't gotten the backburner..D: