A Loyal Coke Drinker's Blind Taste Test of Cucumber Pepsi
WARNING: secretly giving Pepsi to a loyal Coke drinker may result in violent behavior.
So we heard about this new Pepsi flavor coming out in Japan called Cucumber Pepsi. It's the sort of drink they will never release in these fine United States, so when Jona went on tour in Japan (1, 2) we decided to check it out and had him smuggle some back to us.
We decided that Steve Schroeder, being the most knowledgeable person about sodas that we know, was the right person to test it out. We set up the following blind taste test:

The results were, "Not crisp enough." and "Too sweet." After removing the blindfold, "The color is good."
So there you have it! Cucumber Pepsi lacks enough crispness to truly be a refreshing cuke-inspired drink and follows the Pepsi formula of being way too sweet.

"secretly giving Pepsi to a loyal Coke drinker may result in violent behavior"
Au contraire.
Secretly giving Pepsi but telling the Coke drinker it is Coke, results in the same neural response as giving them Coke. As demonstrated by science:
http://www.hnl.bcm.tmc.edu/articles/Read/McClureLi2004.pdf
They didn't test cucumber Coke though...
that's totally wrong.
i would know the difference. i can prove it