Apparently if you use up-side down jar, with rather hot hydrogen gas, and pump cool air through some metal tube from the top, you can have an up-side-down flame...

I don't have the proper tools, do you know of anyone who did it before?
Or maybe somebody can do it?

I guess you could use scratched up one cent coins that got zinc visible with Hydrochloric acid, or any other means of getting hydrogen, and burning air for an up-side-down flame...