Those roll ones: I remember two things about them.
The first was folding and folding a whole roll, putting it in my mate's dad's vice, and then tightening said vice with a length of steel pipe.
The resulting bang was most gratifying..................but it cracked the vice and we had to buy a new one
Another day a mate had a roll at school. He kept scratching a few with a compass point every time the geography teacher turned to the board, with the result that when the guy looked round after hearing the spluttering noise, there was a cloud of smoke just dissipating.
So he asks my mate, "Thompson, is that you?"
To which mate replies, all affronted and as if there's nowt there, "Is WHAT me?"
I laughed so hard I got thrown out of the room.
Unfortunately the deputy head was out patrolling, found me chucked out, and I got one stroke of cane for being out of lesson
Still laugh about it today.