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Will Ferrell gets carried away when building Lego.

Will Ferrell is a perfectionist when building Lego, much like the new movie's baddie President Business.

The actor, who plays two characters in 'The Lego Movie', loves to play with lego, but admits he sometimes gets a little too engrossed.

Will, who is father to Magnus, nine, Mattias, seven, and Axel, four, with his wife Viveca Paulin, said: "I have had moments where I have sat down to help my son build the Millennium Falcon [craft from 'Star Wars'] and have literally told him to leave the room because I have to finish this one part. He can join me later.

"And I literally build it like for an hour. But then it's like, 'My God, what am I doing?' "

The funnyman also admits he gets the same desires to then smash his creations back into pieces that his children have.

Warning: Spoilers!

He added: "There is a part of me that wants to re-create the picture we see on the box of whatever we bought. There's a certain feeling of accomplishment to build the perfect Eiffel Tower. And yet smashing that thing to the ground and starting from scratch, that should be supported, as well."

Will is not the only star to enjoy Lego, as retired soccer star David Beckham has recently admitted he likes to play with the blocks, and they help to "calm him down" after a stressful day at work.