I was just thinking about Ant and Dec (as you do) and I was unsure of who is who (as you are), so I googled "Ant and Dec" and realised that in all the photos of them (bar a few from when they were teens) they stand with Ant on the left and Dec on the right, so the same order you say their names. Is this a planned thing by their management to help people remember who is who or to keep the "brand" intact so that people don't start calling them Dec and Ant, which would weaken their recognisability? It can't just be a fluke, surely...