The campaign that never stops (spawning imitators)

The "got milk" logo
(Source: https://upload.wikimedia.org/wikipedia/commons/a/a4/Gotmilk.png)

Primal Pet Foods tee shirt

The 'got milk" campaign was launched in 1993 by the California Milk Processor Board. Since then it has spawned countless imitators.

I saw "goat milk?" this week on a student's tee shirt. The tee shirt was produced by Primal Pet Foods to promote the firm's pet foods that include goat's milk as an ingredient.

I wonder how much longer parodies of, and references to, this campaign will run.