No, I don't think it's unusual. I've watched a former colleague (now the state superintendent of schools) successfully identify not only pepsi from coke, but co

No, I don't think it's unusual. I've watched a former colleague (now the state superintendent of schools) successfully identify not only pepsi from coke, but coke, diet coke (which he drinks regularly), and caffine-free diet coke from each other in a blind test.