Even planes can light their farts on fire.

That's exactly how I feel after too much chili.

Does anyone know if this is the planes actual afterburner? I can't see how this is usefull otherwise?

And if it is the afterburner it doesn't seem logical. A heatseeking missle would LOVE it. Night stealth would be impossible.

edit: according to OP afterburner seems to be separate, that makes this feature even more puzzling to me? Why not dump from wings like other planes?

Perhaps they're concerned for the environment?

maybe the F-111 is designed for air shows and roasting marshmallows.

Yes, it rather seems to me this is probably precisely the reason all other planes don't have the fuel dump nozzle right by the engines.

I suppose, on the other hand, that at least in this situation, the alternative is spraying the crowd with kerosene, which is probably frowned upon.

The afterburner uses the 2 main exhausts, you can see it in action when the plane lifts at 0:23 just before the central flame starts. I think it's switched off after a few seconds.

I'm not sure what the point of this is, I can only think it is to ensure dumped fuel isn't rained upon anyone. Maybe pilots can roast marshmallows when they're at base, I don't know.