I set a rule for myself a long time ago....for VMC flight at night, in bad weather, and over mountainous terrain.....any one is okay but no more than one at a time. When corporate flying in the mountains east of Seattle....and returning to home at night...my rule was cast in stone....off the pad...through the pass and in the well lit flatter ground by official night time. No debate...no argument...no discussion. If the execs wante to palavver past the deadline...we went to a local motel and flew home the next morning.
After scaring the bejesus out of all us when in a weak moment I let them convince me to fly in some windy and bumpy weather...we came to an unspoken plan that when the pilot said not today....they took their cars and not the helicopter.
All it takes is one moment of in-attention or loss of situational awareness for any reason and you can be in serious trouble quicker than a taxi driver will accept a tip.