The 'vampire sneeze' is a useful, viral, prosocial habit that can be durably etched into our muscle memory.

The 'why' of it is easy to remember, and everyone agrees it's worth doing.

Once you practice it enough times, the muscle memory becomes second nature, and you do it automatically.

The catchy name also helps it spread.

Another example: in the Netherlands apparently there's a habit to avoid opening your car door in front of a cyclist.^[f]

Instead of having to remember to check (easy to forget!) the habit is to open your car door with your inside hand.

This requires you to turn around to open the door, which also by default lets you check if there's a bike approaching.