Strong love locks.

“If you sit down and think about it sensibly, you come up with some very funny ideas. Like: why make people inquisitive, and then put some forbidden fruit where they can see it with a big neon finger flashing on and off saying 'THIS IS IT!'? ... I mean, why do that if you really don't want them to eat it, eh? I mean, maybe you just want to see how it all turns out. Maybe it's all part of a great big ineffable plan. All of it. You, me, him, everything. Some great big test to see if what you've built all works properly, eh? You start thinking: it can't be a great cosmic game of chess, it has to be just very complicated Solitaire.”
― Neil Gaiman