What is the connection between a Tape and a pen?

Before the age of CDs People used to use cassette tapes to listen to music.

People sometimes used to rewind the tape using the pen.

The pen is inserted inside one of the holes in the tape then either the pen is rotated or the hand is moved in a circular motion to force the tape to rewind. 

People used to use pens because they usually fitted perfectly inside the tap holes because those pens had varying thicknesses.

The second reason pens were used is that pens are objects that are easily found inside homes. 

Faulty Cassette players sometimes force parts of the magnetic tape outside the cassette tap. People used to use pens to bring the tap back in place. (See
Why do some people chew on pens?)

Some people used to use this trick when their rewind button wasn't working.

Some people used to do this trick just to play around knowing that they are changing the location of the pointer inside the cassette tape and so changing the song that will be heard when the tape is played. (See What are the symbols of home?)