They might be the most un-Kosher food on the planet*, but Pork Scratchings have an extraordinarily useful characteristic. Let me explain.
Firstly, let's make some... Get a pig. Kill it. Flay it. Carve up all the edibles. Turn everything else into sausages (inc. Black Pudding). You are left with the skin. Chop it up into little pieces and deep fry, with a few added spices and salt. Result. Edible gravel.
This is where the genius of Pork Scratchings comes in.
If you eat normal gravel you generate a huge amount of noise in your mouth (obliterating every other noise) but you smash all your teeth. With Pork Scratchings (although they do advise having strong healthy teeth) you get all the noise but none of the dental damage.
So, next time some drivel-sprouting politician appears on the old box, pop in some Pork Scratchings and crunch. You will hear nothing.
* Actually, Black Pudding might hold this title.