Continue on and see, by the way here's a video to go with it.
Step 1: Tools and materials
*File (possibly avoided)
*A metal pen barrel
*The cap of a bic pen
*Some wire (I used bare steel wire)
*A jet lighter nozzle (If you don't have one I'll soon have an instructable showing you how to make one)
*A lighter reservoir (I used one off another jet lighter that had three nozzles, converted it to one for power)
Step 2: Explanations and safety
Well how this happened... I was making a simple bunsen burner for the pocket instructables and as far as I can tell the new design I came up with affords too much slowing of the air/gas mixture, combined with the fact that the upper casing becomes hot, this meant that the flame reached a critical point and suddenly receded inside and turned in to a jet engine, by putting a tiny nozzle on the end after this may be able to create some thrust.
Again, I accidentally made a jet engine out of a pen.