Art Dudley has an interesting comparison in this month's stereophile.
Two of the examples are brilliant.
a. you don't ask an art expert to make determination of whether a painting is a forgery or fake using a blind ABX test.
b. a blind "sip" test showed Pepsi to be preferred in both Pepsi and Coke's own tests - which caused Coke to launch the ill fated New Coke - but there's a difference between a sip and a full can of the drink - and while some may prefer Pepsi's (and New Coke's) sweeter taste, it's different when you drink an entire can.
Two of the examples are brilliant.
a. you don't ask an art expert to make determination of whether a painting is a forgery or fake using a blind ABX test.
b. a blind "sip" test showed Pepsi to be preferred in both Pepsi and Coke's own tests - which caused Coke to launch the ill fated New Coke - but there's a difference between a sip and a full can of the drink - and while some may prefer Pepsi's (and New Coke's) sweeter taste, it's different when you drink an entire can.

