The crack
That is really embarrassing, not only was your entire butt crack exposed onto the worldwide internet, but it was your friends who set you up for it. If you look at the girl in the back who is wearing the pink and white striped shirt, you will see some x-rated stuff below.
We got you, it’s not actually her butt crack everyone, it’s her friend’s elbow that is squeezed together and placed in the perfect place at the right time. They must have laughed together when they saw how this picture came out, it really is funny. If anything it’s a good memory of their friendship.