Suitcase Emergency - the stuck zip!

An early morning panic situation as Madhatter had a case with a zip that wouldn't shift . 'Have you got a pencil ?' she cried ( not in fun  joph !!) .
I was busy with breakfast so she dashed , got an Estonian pencil and moved the zip !!
Graphite - acts as a lubricant ! Ah the appliance of science !
She finished her mug of tea and caught the next train ,