In London's Piccadilly Circus, McDonalds' ad agency has created an LED sign that actually gets engagement from many of the 34 million people who pass by each year.

The sign is located so that you can pose in front of it and get a funny picture of yourself.

This is a great way for them to make sure their sign stands out and gets attention amidst the noise and clutter of such a busy place.

Check it out at Ads of The World.

What do you think? How else could you get people involved in your ads? Do you think this ad is effective for McDonald's?