The thing on page 4 about chewing I would guess is basically one of those things they tell children all the time to keep them from killing themselves thru stupid, id est:
"Don't just swallow your food, chew it properly."- If you just shove whole clumps of food in your mouth it has a higher chance of getting caught in your throat and chocking you as if you failed Vader for the last time.
"Look both ways before crossing the road!"- Drivers are people to, they get distracted just as easily as anyone else, the problem is they are behind several metric tonnes of steel, iron and aluminium, you're not.
"Don't look down the barrel of a gun. EVER."- Kletus may have taught his 1 day old gun safety like his pa taught him, but the mortician had to teach him this one.