At first, the married couple and family were amused when they spotted guests they didn't know attending their wedding. Dancing, taking pictures in the photo booth. When they got their official photos back though, they noticed that the mystery couple appeared in many of them!
Do you think what they did was inexcusable? Weddings are expensive, and I'm sure they didn't bring a gift. On the other hand, here's another opinion from a FB comment:
"A wedding is a party to celebrate your ceremony. Though they weren't invited, they didn't cause a scene, celebrated your wedding, and had a good time like people are meant to. Those crashers could have been invited by someone else who was invited. What's the big deal? They didn't cause issues for anyone and I bet they made the party better."
These two were in fact tracked down and have since apologized.