The Hollywood A-list star George Clooney, 59, is opening up this week to reveal his favorite part of being a dad to the three year-old twins that he shares with his wife Amal.

Clooney sat down with “Today” show host Hoda Kotb for an interview before accepting the Career Achievement Award at AARP The Magazine’s Annual Movies for Grownups Awards. During this interview, Clooney discussed being a father to twins Ella and Alexander.

“My whole job, really, is to teach them terrible things,” Clooney said, according to Entertainment Tonight. “I really do enjoy teaching my children to do things that shock their mother.”

One example of this involves Nutella and diapers in a gag that Clooney enjoys carrying out while Amal, who is a human rights lawyer, is “having very serious conversations” with a “judge on a trial in the Sudan or a trial in Myanmar.”

“You can take [Nutella], you can put it in the nappy, as if it’s been an accident in a nappy, and then you can put it sort of down around one of your ankles, as if you’ve just taken off your nappy,” Clooney explained. “When mom comes in, they go, ‘Mama,’ and they pull off of their foot, the nappy, and they hold it out like this. And she goes, ‘Oh, OK. Wait. Don’t move.’ And they take it and they eat it.”

While Alexander was initially the child that Clooney would use for his pranks, Ella has become quite good at them as of late.

“My daughter has now picked up the mantle,” he said. “She used to think it was really gross, all the things we did, but then she saw how many laughs Alexander got and now she’s taken it up, too.”

As for how Amal responds to the pranks, Clooney said, “She’s like, ‘Really? That’s what they learned today?’ And I’m like, ‘Well, you know.'”

“The worst thing you can do is leave me alone with them for a long period of time because the things they learn are just horrific,” he added.

Clooney’s full interview with Kotb will be airing on Thursday on “Today and Today with Hoda & Jenna,” and he will be accepting his award on Sunday.