Case in Point: Watch batteries.
Sometime last fall, I was bragging that inexpensive watch batteries were another of the nice perks about living in SE Asia, and my dad totally laughed at me and explained that I'd probably been putting totally crappy batteries in my wristwatch, no matter that they have "Energizer" or whatever etched onto the top.
And then last weekend, my watch abruptly stopped at 7:35 on Saturday morning. There wasn't the sad ticking sound that foretells a low battery, either. It just stopped. And I'd just had it changed in Bangkok this past June when I was there for a check-up.
So, yeah, my dad was probably correct that my cheap watch batteries are probably truly cheap watch batteries.