Clearly, the Blendtec, "will it blend" videos, are a marketing tool designed to illustrate the power of the product, as opposed to illustrating recipes for delicious smoothies. Is it safe to drink? There is nothing here: http://www.coconutresearchcenter.org/ that I have been able to find, which deems the "woody part" inedible or unsafe. So, strictly speaking, that concoction is probably safe to drink (but I am no expert on coconut shells or pineapple leaves). The more important question is, why would you want to? I imagine the shell of the coconut and the outside of the pineapple would add bitterness and grassy flavors that would be off putting, plus, who wants to drink something that looks like that? I further imagine the texture would be somewhat uncomfortable to swallow. It just doesn't look appetizing. One of your tags is "efficiency." There are reasons that we peel our fruits and veggies, even though it may be less convenient. Safety may be one reason (maybe concern over pesticides?), but more often it is flavor and color that we are after.