You are on fire.

[CarpathianMuffin]

I'd bolt for the shower, turn it on full blast, and just flail and stomp around until the fire goes out.

 

[Geekosaurus]

Run around going 'oh crap I'm on fire!'

 

[Nedoras]

I'd run to the bathroom which is only 15 steps or so away. Not wanting to miss an opportunity I'd try to scream "somebody get the motherfucking marshmallows!!!!" through the agony ^_^