That's exactly what happened to Suzy fans who went to her birthday fan meeting. Fans were told that from 5-7PM, fans who came to take a photo at the photo wall would be gifted a fan meeting poster. Fans of course, came to take photos at the photo wall, and when they saw their photos afterward, they were shocked to see Suzy prancing about behind them.
The event was actually planned by Suzy herself, who wanted to throw a surprise event for her fans. She stayed silent throughout the photos to make sure the fans taking photos didn't actually get to see her until they checked the pictures themselves. When they did, they saw the following:
What a cute event!