Ok, so this may be an old chestnut, but I had never heard it before. From the ANiC Newsletter:
Just for fun
Elizabeth asked her Sunday School class to sketch a picture of their favourite Bible stories. She was puzzled by Bert’s picture, which showed four people sitting in a plane, so she asked him which bible story it was meant to represent.’ The flight to Egypt,’ said Bert. ‘I see … and that must be Mary, Joseph, and baby Jesus, ‘Elizabeth said, ‘But who’s the fourth person?’ Oh, that’s Pontius – the Pilot.

What about the flea? It should have been onboard too.
I heard the child also drew a fat person. When asked who this was the child replied – round John Virgin.
I must admit that as a child, I thought Pontius was a description of Pilate, rather than a name (like Blind Pete), but I had no clear idea what it meant…