premise: How to get a ball point pen writing again when it stops, even though there is lots of ink in the pen?
hypothesis: For the brave, dabbing the nib onto your tongue is one way to lubricate the ball and this may get the ink flowing again.  You can also dab it in honey or oil if you prefer. You may prefer to hold the nib over a lighter for a second, which can enable any dried ink to become liquefied and able to flow freely once again.