As heard on Kidd Kraddick in the Morning this morning, J-Si and his son Cason got the opportunity to interview Will Ferrell and Zach Galifianakis during their promotional tour for their upcoming movie, 'The Campaign.'

Instead of asking the typical questions about the film, J-Si decided to have a 'nanny-off' between the two comedians, which included a kiss and some funny faces to try and make baby Cason laugh.

Find out who won the nanny challenge below, and watch the hilarious trailer for the movie 'The Campaign', which opens in theaters on Friday, August 10th.