Chris O’Dowd plays the long game with an elaborate prank on his baby son

Remind us never to get on the bad side of Irish comedian Chris O'Dowd...

The likeable actor appeared on Conan O'Brien's show to explain a hoax he is preparing on his teenage son - who is currently only 15 weeks old. It either makes him the coolest or cruelest dad in the world. We'll let Chris himself explain, but it involves photos with strangers in the park and the fooling your first born into doubting his parentage... https://www.youtube.com/watch?v=8Z8dceTg1Aw