[mynewwork]

Adding to JasonCEC's comment, a semi-famous example of this phenomenon appeared in the blind taste-test challenge Pepsi marketed vs Coke.

Pepsi, being slightly sweeter, was preferred when participants took a single small sip for a taste test. However, when drinking an entire can, people were more likely to prefer the less-sweet Coke.

[LanceH]

I've never understood this one. To me Pepsi always tasted like a diet product. Sure it is sweeter, but never the right kind of sweet. And I can't comprehend the people who can't tell the difference between Pepsi and Coke.

[yellowapple]

I think the canned varieties of both taste pretty metallic, but especially Pepsi.

I've taken to opting for the glass-bottle varieties of both; whether it's the lack of aluminium traces in the soda, the use of sugar instead of high-fructose corn syrup, or me having opportunities to collect bottle caps as if I'm trying to make a living in a post-apocalyptic nuclear wasteland, I've found that to be much more enjoyable for whatever reason.

That all said, RC Cola is the superior beverage. ;)