Tit for tat

[McMouse]

Sadie, an elderly, rather poorly dressed lady is in a lift in a well known London department store on her way down to the ground floor. On the 4th floor, a beautiful young woman gets into the lift wearing what to Sadie is an expensive perfume. The woman turns to Sadie and says, arrogantly, "Balenciaga, £100 an ounce!"
On the 3rd floor, another beautiful woman smelling of expensive perfume gets into the lift and very arrogantly turns to Sadie and says, "Christine Dior, £150 an ounce!"
When the lift reaches the ground floor, as she leaves the lift, Sadie looks both beautiful women in the eye, bends over, farts and says, "Broccoli – 75p a pound."

[marval]

Heard it before, still like it though