I'd say the apple trick was more of a "cool cut" or nice swing then a sharpness test?
This is a old one and I know pictures are not as impressive as video, but I'd say fish heads a lot harder then apples. I do this trick all the time at work just for fun. I line up all the heads from the fish I just cut and see how many I can swing threw with out them falling over. My record is 4 heads clean cut, 7 heads with the last 3 falling over. Now that I can shoot video on my phone I'll start taking some, still have to figure out how to post them
Of all the posted videos I have viewed so far the most challenging one has to be the one Salty did when he peeled a tomato free standing on the cutting board. U MEMBER.....I've tried that one and it IS difficult.
I was wondering the same thing about the apples because the bottles usually move when you cut them.....as in cleft halves of bottles and water flying everywhere.:lol2: One of the neater tricks that I have seen was Kevin Cashen cutting empty half liter water bottles with a big O1/L6 damascus chopper.