Thought Provoking

Thoughts run through your head constantly, at work at home even in your sleep, You dont always have a pad and pen to right them down, so what makes you remember one thing more than another? Is it a feeling, is it an assignment, is it something to add to your to do list, or is it something you have been thinking about constantly, repeatedly, heart provokingly, unbelievably,inevitably, the feeling of ... you fill in the blank.