(CNN) At first, Stacey Feeley thought that her daughter was just being funny when she was standing on the toilet.

"I thought she was doing something cute," she told CNN's Rosemary Church in an interview.

But her mischievous 3-year-old was practicing a lockdown drill -- hiding from a potential attacker, hoping to avoid the type of tragedy that she likely isn't able to fully comprehend at such a young age.

And when Feeley realized what she was doing, she broke down.

Many of those commenting on her Facebook post with the image -- especially those outside the United States -- expressed surprise at the fact that such a young child has to practice this sort of drill.