On food packaging, there are certain adhesive solutions with all the right food contact statuses, but some cheap buggers go for the budget adhesives in their processes. That's why some microwaveable meals you end up with plastic film in your meal or being heated up in the microwave. Cost cutting, and we are probably talking a fraction of a penny per unit.
Light bulbs is an annoying one. Despite a complete rewire at home, most of our light fittings can't take all 3 or 4 bulbs at a time, one is bound to blow within a week. Especially the newer energy ones, which also have the innovative feature of needing time to warm up to full brightness. Just what you want went you get home at 11pm in pitch dark.