An unpleasant “surprise” was found in the wall of their home.

In North Carolina, USA, three-year-old Sailor Klass complained to her parents about “monsters in the wall.” At first, the parents dismissed it as just a vivid child’s imagination, but the “monsters” turned out to be real.

As it turned out, the child’s room was home to thousands of bees.

Initially, the parents believed it was merely the result of watching the Pixar movie “Monsters, Inc.” They even gave her a “monster spray” in the form of a bottle of water, but the “monsters” didn’t go away.

Later, Sailor’s mother noticed a buzzing sound above her room and discovered that it was bees. After contacting a pest control company, they learned that these were honey bees—a protected species in the U.S.

A beekeeper noticed that the bees were gathering right above Sailor’s room, pried a piece of the wall away, and found a hive.

“They just poured out, like something from a horror movie,” said the girl’s mother, Massis Klass.

The beekeeper was able to collect the bees from the wall and relocate them to a bee sanctuary. In total, he removed about 60,000 bees and 100 pounds (45 kg) of honeycombs.