I sometimes see this anti-wrinkle cream ads on the TV. Every time I think that it would be very easy to do an AB test, just spread the goo on one side of the face and not on the other. IF they really worked there would be a difference.
I also think that it would be very easy to do an AB test on mic cables. Simply use two matched mics placed really close and run them through two different cables. After a while, switch cables so you could judge how much of the difference is from the mics, and how much from the cable. If there really was a large difference it would be obvious.
But, well, the never do proper AB tests on the creams. What about the cables?
Gunnar