Will comes home to his two-storey house, to find his daughter Elsie reading some school books. He asks where Mother might be, and finds she's off getting home defence lessons. He's been chosen, he tells Elsie, to deliver a speech on this topic. He starts reciting what he intends to say as we segue into scenes of him reacting to an incendiary that's gone through his roof, coming down somewhere upstairs. Will clumsily gathers up his fire fighting equipment, including a shovel, bucket and water pump, all the while never letting go of a frying pan he's been trying to cook bacon in. He finds it's gone harmlessly into his half-filled bath tub, fizzing out. But another time, one's landed atop the peak of his roof, and is burning away. Will arrives at the top with tools ready, but it bores it's way through to the bed room. He scrambles down to it, but just as he gets there, it's burnt through the floor to the parlour below. Dashing down to face it there, he realises it will elude him once more, so he runs down to the cellar to head it off. Just as he sets up, the bomb comes through the floor and lands in his pail of water, sharing the fate of the previous one in the tub. Will pretends to take credit for planning it that way, though it's obvious he had no idea it would go that way. Now, fading back to the present, Mum returns just as an incendiary comes crashing into an upstairs room. Will's easily confused, but Mum and Elsie calmly gather the tools and attack the flame spitting missile, by Mum crawling into the room with an upturned chair in front of her, aiming the pump's hose nozzle at the flames. Elsie pumps the water, and Will goes for more with the bucket, in a seemingly out of place gag, he casually lets it fill slowly under the bath tub faucet, though there's plenty of water in the tub already. Mum puts out the small fires first, then attacks the bomb itself, as per Ministry of Defence teachings. After all's put out, Mum admonishes Will for not taking training as she had. He promises to go do that, after learning the training centre is next to a pub.