i didn't watch the video, but as i mentioned before, you can "eat" real lightbulbs, and presumably light tube glass is the same or similar. it's not that thick. you just grind it on the back of your teeth
you may have seen a trick where you take a bunch of beer bottles, you smash them up, then put them in a bag and shake the bag "to put them into even smaller pieces", then they pour the contents into something like a cat little tray and lie on the broken glass, sometimes add a paving block etc. well you'll notice they only do that with coloured glass, so green and brown bottles, as those are recycled glass, i think they put the colour in to hide impurities etc. when they put the broken bits in the bag and shake it, it actually rubs the sharp edges down and blunts the broken bits, so that's why they shake long and vigorously, usually getting an audience member to do it and encouraging them to shake a lot to make smaller bits on the pretense they are sharper, but it works the other way. you will also notice they also pull bits out of the tray to show the audience, and usually throw them at someone for effect, they are getting rid of anything that might cause serious damage. you will usually get marks and some cuts doing this, but it's not as bad as you might think, and after doing it a while your back gets used to it as you would with playing guitar and getting callouses
and chainsaw juggling and cutting initials into apples in peoples mouths. there is no chain on the saw. it's replaced with black tape that looks like a chain. of course at speed it can cut apples. it could also make a mess of your face, but it wouldn't cut your arm or head off if you made a mistake. i've literally had the chainsaws rubbed in my groin so can confirm it doesn't hurt