... when opening new boxes of cereal, or boxes of foil or clingfilm? You gotta do it with CARE and ATTENTION otherwise everyone who uses them will get irritated on a daily basis for weeks or even months!
That means no popping open the little sides of the foil box, no pulling the teeth bit off of the box, no ripping at the top of the cereal box so that little slot gets broken.
See also:
opening plastic packets (nuts, rice, pasta etc)
NOT relying on the 'self-seal' stickers which I've never ever seen stay stuck
dishing out a ready meal (needs forethought and usually a knife around the edge rather than random dolloping, to avoid half of it being left in the plastic box)
opening loo roll multipacks along the top or even perforations if the have them, not just ripping a stupid little hole in the side and wriggling one poxy roll out
YOU ARE EXCUSED if you open those frozen pea (etc) packets 'rip here, do NOT cut' with the ziplock seal inside the pack. They always go wrong.
No, I'm not particularly irritable today, why do you ask? 