How to Write Upside Down With Pen

so u may face this problem that when u lie down on bed and u want to write somthing ur pen will passout and u have to wait a little bit to get it back on track here is a simple solution hope u use it at home the only thing is by putting plastic blocker at the end u block the air from getting out and as a result u defeat the gravity

Step 1: Prepration and Done!

as simple as u see,as u know after some writing it will stop this happen because of negetive pressure that produced in pipe ,u need to recap the plastic blocker once a while to make positive pressure raise again