Cheers , I ripped off Superman
No, not that one. The idea of Rey just finding a random lightsaber one day.
Okay it lands in a melted state and Rey finds it on her scavenging travels,not realising what it is, repairs it and makes it more powerful and then becomes intrigued with the force and the backstories and realises she has a natural ability with the saber, yet to realise that she is indeed force sensitive.