Janus-1A foldable helicopter - GIF

Janus-1A foldable helicopter.

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Previously:

1922 Pescara helicopter - GIF
AeroVelo Atlas human-powered helicopter - GIF
Helicopter dance - GIF
Helicopter lands on trailer - GIF
Linemen working while dangling from a helicopter - GIF
Ultralight mosquito helicopter - GIF

At what point does a drone become a helicopter? And vice versa for that matter.

Probably when some govt agency says so. Imagine you are not allowed to fly a helecopter but you can fly a drone. To get around the rule you would fly yourself in the helecopter using remote controls as a drone does. SIMPLE EH?