I just finished a Captcha challenge with 14 steps, mostly because they present so many uncertainties:
Are crosswalk lights considered to be part of the crosswalk or are they traffic lights?
Where do mopeds end and motorcycles begin? Is the rider considered to be part of the motorcycle?
How much elevation increase is needed to constitute a hill?
Is a Volkswagen Bus consider a car, a truck or a bus?
Is a unicylce considered a one-wheeled bicycle? How about two unicycles close together?
Is a dinghy a boat?
Is a tree considered a boat or a guitar? Both are made of wood.
Is a very small person atop a very large guitar considered a boat? If one put wheels on that same guitar and pulled it with a truck, would it count as a trailer?
If I throw a very small rock into a pond and it floats, am I considered a witch?
Oh, I have so many questions. Somebody please enlighten me.