First they haven't used lead in pencils in years. Many many years. Due to the possibilty of lead posioning. They are all graphite now.

Second a story about lead. When i was young me and my grandfather used to make our own fishing weight by melting lead and pouring it in molds. We used to do this inside in his not very ventilated kitchen. When lead is boiling i any water gets in it the water boils instantly quickly expanding causing the boiling lead to explode. My mom walked in the kitchen and got a drink and as she was walking out of the room dropped the cup. The cup landed on edge shooting a small stream of water into the air. Me and my granfather dove on the ground and covered our heads and then... BOOM. When we finally got up the entire kitchen was covered in a coating of lead. It was every where. The cabinets, the table, the floor, us. Everything was covered inb lead. The best part though was the lead stalagmite that now hung from the cieling over the stove. It took a good five or six hours to remove all the lead from the room and from then on we had to make weights outside.

DISCLAIMER: Ok, here's the thing, please don't fucking do this. This is a bad idea.