I burnt my first pair of wellies on a Scout camp years ago, when I was about ten, putting out a campfire. I liked the way that my feet got hot from the flames but the boots protected me. The next year, when nobody was looking, I put my foot over the flames and let them melt the sole of my boot - unfortunately I have not had much chance to burn boots since then
The last time I tried was indoors (after I was married) - I had to make and burn a proper meal to hide where the soot and horrible smell had really come from!
Since then I have discovered that petrol seems to do funny things to wellies (makes them less flexible and go "crusty") if I "accidentally"

spill some when refilling the lawn mower, and that leaving rubber boots in sunlight all year round makes them go funny colours after a while - all faded and streaky.
I also have an old pair of green wellies ( a bit like Hunters) with the right buckle bit broken (the metal snapped!) and they are quite worn down after several years - and they're no longer waterproof after I "accidentally"

stepped on some barbed wire a few times.