George Clooney taught his twins to pretend they eat their own poo.
The 59-year-old actor-and-director revealed three-year-old Ella and Alexander - who he has with wife Amal - love to "freak out" their guests by smearing their nappies with chocolate spread and then sticking a finger in to eat it.
The famous prankster said: "They both have learned to play pranks, which is good fun.
"I did work with them on putting Nutella in a diaper and then eating it.
"Whenever a stranger is around, they'll come in holding it, like, 'Papa, it's a dirty nappy!' and I go, 'Okay, I'll take care of it,' and then they eat the Nutella out of the nappy.
"You can imagine the freak-outs we get…. Yeah, I taught them that."
The 'Midnight Sky' actor has accepted the fact he can't often do the things he enjoys at home without being interrupted anymore.
He told People magazine: "Yeah, the times I used to be able to sit back and read a book, that's done for a while.
"Like I was watching game six of the World Series, the winning game for the Dodgers, and my son had a dream that a dinosaur with fire was coming after him. It was just when Mookie Betts hit the home run, and I'm trying to comfort him. So things have changed a little bit."
Even before the coronavirus pandemic struck, George had been planning to spend more time at home with his children.
He said: "I haven't been working as much as I had before we had the kids, so I had every intention of focusing on them [anyway], putting them to bed at night and stuff, so we didn't need to be forced into that by a pandemic."
And the former 'E.R.' star felt "lucky" because he didn't have to do any homeschooling with his kids.
He said: "I'm lucky because our kids are three, so I don't have to homeschool trigonometry. I can survive with just spending time with them."