Well, imagine it. Say I'm the Secret-Keeper for my house. The perimeter of the spell ends just at the doorstep. I Apparate every day just inside the perimeter, right on the front porch, so that no one can see me enter. Say I miss my entrance one day and land too far back or that someone grabs a hold of me while I Apparate and they end up inside the circle of the charm. This would effectively give them the secret. In theory.

[Speaking from experience, NO OF COURSE NOT. There's a smile in her voice as she continues.] You're a friend, Xion. It's the least I can do to make the village a little safer.