That sounds like a perfect project! Picture a dragon’s mouth that snaps shut, but you need a special key that’s actually a Lego piece glued to a tiny puzzle – only the right combination will wiggle the jaws. Use a sturdy, non‑magnetic bolt inside, and a quick‑release lever that’s a secret button hidden behind a dragon scale. And if you want it extra fun, paint the scales neon like those old Saturday morning cartoons – the kids will think it’s a portal to a candy kingdom, but it’s actually a vault! Just don’t forget to staple the glue gun nearby; you never know when a spontaneous dragon‑flame pop‑sicle idea will hit.