Using punctuation to mislead

When a new pharmacy opened in my local shopping centre, I was interested to see the sign saying it was Australia's Cheapest Chemist.

But wait a minute...

There's some tiny print on the sign - Is this?

So, the sign might say, 'Is this Australia's cheapest chemist?'

Horrible punctuation, though - 'Is this? Australia's cheapest chemist.'

Who knows? I'm not going to find out, because I think a shop that indulges in such deplorable punctuation is best avoided.