I once saw a demonstration (I think on TV) of an anvil which was turned upside down to expose a recess in its base about 2ins square by a half inch deep. This was filled with black powder and another anvil placed on top with a fuse to set it off.

Bearing in mind the anvil weighed around 50kg, when the charge was fired it shot it around 100 feet into the air. Some kick

You should try a thunderflash locked in an inverted ammo box, that blows all the rivets out, flattens the lid and shoved the box minus handles about 60 foot into the air…… Not that we erm did such silly things….. Ever been tangoed? Orange smoke grenade dropped into a tent while someone is in their maggot turns everything bright orange, including their clothing lol…. Again no one would ever erm do that in the field. :p often wondered what the next person to use the tent thought when they unpacked it to find a bright orange interior.