The ThunkFactor is a metric for judging the worth of a document, for example course notes. Since YouArentGonnaReadIt (or rather your students aren't), it's important that your notes make a satisfactory thunk when thrown on a desk so that the student is led to believe that there's value within them.
Hmmm, I wonder how many projects suffer from this with their documentation?
This brings us to the observation that, for a number of subjects, usefulness is inversely proportional to page count.
Mentioned with respect to course handouts on YouArentGonnaReadIt.
Oh. So this has nothing to do with how much you thunk when you made the document. Hmmm.
It takes an immense amount of thinking to produce a thin document. Thick documents are thick because nobody thunk. Which is why they go thunk when you plunk 'em.
See also: ShortBooks, TheAlmightyThud