tube ad that made me smile

In small text in the middle of a banner, approx:

  If you're reading this,
         you're inquisitive. Free thinking.
You're curious about other perspectives,
     determined to develop your own.

Or you thought this was one of those
                 Poems on the Underground.

... for theguardianmembership. They have absolutely met their target audience, and know exactly what they are doing.