She's home from work, and the entire house smells of Ethyl Mercaptan. There's a gas leak, something that scares the shit out of her. Her heart's thumping too hard in her chest, and she's panicking. She opens all the doors and window, yet it's suffocating. She turns off the gas cylinder. It takes time, but eventually, the smell vanishes. By then, she's regretting not lighting up a cigarette earlier, before she opened the doors and turned off the cylinder.