As IO540 mentioned, at night, even CAVU VFR can suddenly become the equivilent of IFR if you head out over water, or another poorly lit part of the world. JFK jr. found this out the hard way, I hope we all learned (again).
Similarly, right after breaking ground on a takeoff toward a poorly lit area, pitch attitude can be difficult to judge. Get ready to refer to the attitude indicator in a hurry if you need to. Some hood experience vital!