Pop quiz time:

You use one to rewind the other.

Or fast forward. ;)

You can also use the pen to label the cassette. Later you'll Tipp-ex/wite out the label and write over it again. Then you'll get a new cassette and remember they came with lots of blank sticky labels which you'll put somewhere safe and forget about ten minutes later.

Gotta use the octagon Bic pen with the grooves to roll back the tape into the cassette because it would always unravel.

I'm twelve and I knew what it was for ..... my grandma had a few

You take the pen and jam it into one of the holes and twist it. Do it twice and you've fixed a tape. I remember because I had a miniature set when I was 3

you can rewind the tape with the pen :D

You can rewind it.... I'm 17

REWIND THE CASSETTE

I used to have so many cassettes I'm old I'm almost 16