Given the task definition and input, reply with output. In this task, you're given the title of a five-sentence story and the first four sentences. Your job is to write the last sentence of the story such that it seamlessly connects with the rest of the story.

Title: Fun in Chemistry. Sentence 1: The professor explained today's experiment. Sentence 2: Everyone put on their safety equipment before beginning. Sentence 3: I ignited the Bunsen burner to heat a substance. Sentence 4: Since i didn't release that the gas was running, a flame sparked.
It burned off a part of my eye-brow.