Coanda effect - a cylinder can generate lift in an airflow by rotating on its axis, or by inducing the air to flow faster on one side.
Coriander effect - big night on the beer and curry, can cause urgent visits to the bog.
Throttles on the collective seem to rotate in the same direction, throttles on the floor (Squirrel) or roof (twins) have the same orientation of forward for full throttle.
Bell 430 is the odd one out, with throttles looking like motorbike setup, but (I believe) rotating the opposite way.