Gliding under pistons

I was on my server, Neonicraft, when I accidentally started gliding. At first it was obviously no big deal. But little did I know that I would fly into a staff table made of extended pistons and glide under it! I was able to do it several times, all by gliding at the extended pistons several times, lining it up perfectly. I was even able to move around them until I moved to the edge and walked back up through the pistons to the floor again.