If you had to go into another specialty that is NOT your own, which would you choose?

Just curious on how people of different specialties may see the grass as greener over the fence. If you were to go back to the age you were when you started residency and restart training in a new specialty, which would you do? In the spirit of the game, no picking alternate routes to the same destination (e.g. no going from IM->Palliative to FM->Palliative).