[ siren ] >>> the problem with pranks is es calation. this prank, i have the suspicious feeling this one day may be called -- >> katherine's worst nightmare is for someone to break in the house. >> come on. you don't play like that. >> when we cut to the bedroom >> it's not only her, but it's also her child. >> he's playing with fire. >> as a father myself and a husband, i'm like, don't. >> around this point, he hides her phone so she can't call anyone. he's texting his buddies, time to pull the prank. you hear. immediately, they're kind of wait, wait, what's goi serious. she goes for the baby while he locks the door. >> they're going to hide the baby inside the cup board. she's obviously looking a little panicked. >> nimy boyfriend is on the way. i already called the cops. >> why isn't she like screaming help, help something? >> she's a mother, and she's got to keep her cool. >> my purse is right in the kitchen. that's all i have. there's nothing up here. >> you can hear them coming up the stairs. pants. the door handle now. she doesn't

[ siren ] >>> the problem with pranks is es calation. this prank, i have the suspicious feeling this one day >> katherine's worst nightmare is for someone to break in the house. >> come on. you don't play like that. >> when we cut to the bedroom later on -- >> a baby. >> it's not only her, but it's also her child. >> he's playing with fire. >> as a father myself and a husband, i'm like, don't. >> around this point, he hides her phone so she can't call anyone. he's texting his buddies, time to pull the prank. you hear. immediately, they're kind of wait, wait, what's going on? now she realizes this is serious. she goes for the baby while he locks the door. >> they're going to hide the baby inside the cup board. she's obviously looking a little panicked. >> my boyfriend is on the way. i already called the cops. >> why isn't she like screaming help, help something? >> my purse is right in the kitchen. that's all i have. there's nothing up here. >> you can hear them coming up the stairs. she frantically puts on some pants. the door handle now