Parents found a lighter in my backpack?

My parents found a lighter in my backpack and I've been getting into trouble lately for alcohol and boys and stuff and they assume I smoke weed but can't prove it but today they found a lighter in my backpack and I don't know what a good lie is to hide it and they won't believe the pyro thing cause they're overprotective I need a story to make up with details as to why I have it I n�ed help can anyone that's a good liar help me out ?!?!