I just had to post and say I've now opened two coconuts with my table saw. Yes. I. Have.
If the blade height is adjusted just so, the blade will burn through the hard outer shell of the coconut, leaving the white meat in tact, and the coconut water safe on the inside. All I have next to do is cut through the meat with a knife, catch the water, and voila...easiest coconut I've ever eaten. I'm perfectly aware I could take a big cleaver and whack a coconut in half. Problem is I never hit hard enough the first 20 times, so little coconut shell chips fly all over the kitchen. With the table saw, I can score the coconut so it breaks into sixteen pieces, and I get the meat out with more ease.
The downside: coconut-sawdust in a thin layer over my entire body; coconut sawdust in my sinuses and eyes; sneezing from all that coconut in my nose.