1 Rottweilers: Grrrr!
2 Monty: These rottweilers look vicious.
3 Monty: If only we had some meat. A steak or something.
4 Prof. Jones: Yes, I could do with a snack.

Brown is not a recommended colour for rottweilers, according to the breeding societies who care about that sort of thing.

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2017-07-01 Rerun commentary: According to the American Kennel Club:

Color: Always black with rust to mahogany markings. The demarcation between black and rust is to be clearly defined. The markings should be located as follows: a spot over each eye; on cheeks; as a strip around each side of muzzle, but not on the bridge of the nose; on throat; triangular mark on both sides of prosternum; on forelegs from carpus downward to the toes; on inside of rear legs showing down the front of the stifle and broadening out to front of rear legs from hock to toes, but not completely eliminating black from rear of pasterns; under tail; black penciling on toes. The undercoat is gray, tan, or black. Quantity and location of rust markings is important and should not exceed ten percent of body color. Serious Faults - Straw-colored, excessive, insufficient or sooty markings; rust marking other than described above; white marking any place on dog (a few rust or white hairs do not constitute a marking). Disqualifications - Any base color other than black; absence of all markings.

I'm not sure if that means brown ones are disqualified from being shown as rottweilers in official dog shows, of they're disqualified from being rottweilers at all.