You're not going to have flames chasing back up into the wing, like in cartoons.
When the guys who designed the thing tell me it's a bad idea I tend to at least give it a listen. I know of at least one aircraft that literally "exploded" out of the sky, granted it was in the 30s and due to a design issue, but it has happened.
The Samoan Clipper
F111's used to deliberately "dump and burn" for airshows but they had to have the reheat on to ignite the fuel,
AFAIK.
Too bad we're not all in F111s then.