It's a simple premise, take your own picture, but provides a huge impact. It's not just about pictures, it's about entertainment. Every event I've ever done the photo booth has been a huge hits (just check out the gallery links above).
I setup a backdrop, a camera on a stand, studio strobes, and a display. Your guests stand in front of the backdrop and use a foot pedal to take the pictures. They pop up instantly on the attached display and everyone can see watch the party unfold.
The photos were born for social media. I provide every guest a link to the website and allow the photos to be downloaded for free from the online gallery. I like to edit every photo and upload everything the next morning, so people can relive the event again.