True story: I was once (late 90s, I think) made part of an impromptu taste-test in a 7 Eleven store in Stockholm [1], when a (probably bored) employee grabbed a Coke, a Pepsi and a Dr Pepper and some espresso-size paper cups and made me and some friends close our eyes and try to guess which was which.

I remember being upset since he claimed I failed to even point out Dr Pepper, which I still think is unbelievable since even its smell is super distinctive and way different from a cola.

[1]: https://www.mitti.se/nyheter/buset-pa-kungsgatan--butiken-bl... is the same store, article (in Swedish) about a recent prank someone did there