Extinguish a candle and bring a new flame slowly into the smoke of the extinguished one. Get close to, but do not touch, the wick of the extinguished candle. What will happen? If you do it right, the smoke will catch fire and re-ignite the wick, as seen here. This happens because the smoke contains wax from the recently extinguished candle; the wax is highly flammable, and creates a pathway back to the wick upon which the new flame may travel.