Because we need more silly, brainless and fun things to do whilst bored. :D
Most of you probably know how to play but let me give you a quick example...
"Would you rather buy a truck or a van?"
The next person answers the question and asks a new one in their post,
"Truck. Would you rather smell my finger or smell my foot?"
And so on...! :D
So,
"Would you rather be at sea on a sinking boat or on land in a burning building?"