The brothers resume their crusade against the mouse, chasing it down with a shotgun, on the against it, accidentally destroying part of the floor by shooting the bug bomb that Caesar had dropped, and then turn on each other when they overhear a voicemail exposing Ernie's attempt to secretly sell the factory and Lars previously declining their offer. During their argument, Lars throws an orange at Ernie, which hits and stuns the mouse. When the two cannot bring themselves to finish the mouse, they seal it in a box addressed to Fidel Castro. The brothers reconcile and finish their renovations. The night of the auction, however, Lars discovers the mouse's box was returned due to insufficient postage and with a hole gnawed out of it (as Lars forgot to weigh the mouse). As the auction progresses, the mouse wreaks havoc. In desperation, the brothers attempt to flush out the mouse by feeding a garden hose into the wall, but Lars accidentally breaks the spigot off, causing the inner walls to fill, collapsing a wall in the room in which the auction is taking place, and flushing out them and the buyers. The house collapses as the buyers flee. April leaves Lars for good for a particularly rich and older bidder, and the brothers take solace in the assurance that the mouse must have perished in the collapse.