Construction is underway for a new freeway. The vibrations wake Bugs and cover him with dirt. Bugs confronts a beefy construction worker (voiced by John T. Smith), and when he realizes that a freeway will be built going through his home, Bugs refuses to move. The construction worker tries to blow up Bugs' burrow, but only succeeds in creating a crater with a large narrow pillar in the center, with Bugs' home still intact ("I hear ya knockin', but ya can't come in!")
The construction worker continues to try to get Bugs out using a rock cutting saw, a bomb dropped from a helicopter, a 60 ton weight dropped from a construction crane, and a stick of dynamite dropped from some scaffolding, but Bugs always manages to outwit the worker. Finally the worker tries to pour a large amount of concrete on top of the hole, but when it dries, he finds out that Bugs has diverted the concrete around his hole with an umbrella, reinforcing the pillar, and defiantly placed a door and mailbox on top. A shot of a local newspaper is shown, with a picture of Bugs on the front page, and a headline that reads "CITY REACHES COMPROMISE WITH RABBIT!!", followed by a scene that reveals that the freeway is ultimately abruptly diverted around the hole, in literally a half-circle. Bugs pops out of his hole to declare: "The sanctity of the American home must be presoived (preserved)!". This quote is from an attorney's argument in an 'alienation of affection' lawsuit involving a couple of the last name Kellogg in 1935 (Chicago Tribune archives).
What did a bomb drop from?
Helicopter