is mother never knows best or some thing

all I see is "never knows best"

'mother'? who thought of that?

Never Knows Best is just what Mammimi's ciggarete says, probably just pointing out that she doesn't care about the health hazards.

In the audio commentary on the DVD the director says it is simply a saying about how so many people go throught life never nowing best. This was givin to Mammimi's ciggaretes to indicate that she has givin up on people and society.