The parents discover the vault that the kids have made the room into and start questioning the realness of the room.
The parents start to wonder if what they seen is real,and about their kids state of mind.
The kids throw a tantrum when the father announces hes going to turn the whole house off. While the mom is trying to convince him to let them have 5 more minutes.
Literary Term - Irony
The kids lock their parents in the nursery after they came running to the fake screams.
After the kids lock their parents in the vault and the lions eat them. The therapist comes over looking for the parents only to see the kids having a tea party while the lions eat 'something' in the backround.
I think its ironic how the parents didn't even know the screams they were hearing was theirs the whole time.