I still remember an episode of Blue Peter where they got you to make your own Tracy Island. I vaguely recollect blocking the toilet with toilet paper as you needed the inside of a toilet roll for part of it.
This was in the early 90s when thunderbirds was being reshown on tv, comics reprinted and in the shops, toys available at all good toy shops etc
Howver the toy Tracy island was out of stock - demand exceeded the supply. With Christmas rapidly approaching and a lot of kids about to be unhappy, the “build your own” program lodged in the national conscious - everyone knew Blue Peter, it had been running for decades with its sticky back plastic and one they made earlier.
This sounds so much like something my youngest would do, haha. I always wonder if the creators realize when they come up with this stuff that a ton of rogue kids are going to flush entire rolls to get the tube.