WATCH: Robbie Keane Plays A Brilliantly Cruel Prank On His Unsuspecting Son

They say the old ones are the best.

Irish football legend Robbie Keane hasn't kicked a ball in a while so it's safe to say he has a lot of spare time on his hands.

Which is probably why he's taken to playing cruel pranks on his son Robert Junior.

The poor young fella fell for this one hook, line and sinker and his dad wasn't shy about rubbing it in his face.

We reckon young Robert is still a bit wet behind the ears, in more ways than one, but he'll learn to cope with his auld lad's messing in time.

Take a look: