How many angels can dance on the head of a pin? 
 This exact question puzzled theologians for many hundreds of years, and led to many differing points of view. The issue with the question is that there is no correct answer- firstly, are angels real? If they are, how big are they? are they even able to dance? if they could dance, how much space would they need? Secondly, how big is the pin? is the pin a normal sized Earthly pin? or something much larger, on a celestial scale?

The answer relates to faith- if you believe in angels, you believe in their ability to dance, and believe in their specific ability to dance upon a pin, and can have an argument in any direction based on your faith that they underlying premise of the question could be a likelihood. If you do not have that faith, then your outlook would likely view this question with a great degree of cynicism, and you would probably view it as a pointless question.

But with a degree of humour, and a tip of the hat to Douglas Adams, I'm happy to conclude that the answer is 42.