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Most of the time, people don't pay much attention to bus stop ads, but every once in a while, there are ads so clever, you can't help but be captivated by them. This interactive bus stop billboard from Johnson & Johnson, for example is a real head turner.

To grab your intitial attention, there is a giant image of an attrictive model lounging in a bikini. To keep your attention, they've istalled a knob that you can turn to crank up the bronze factor of her skin.

The tagline reads, "You can have the tan you want. Choose yours."