Poems in tubes

To all poets and those who like poems:
When I sat in the tube yesterday I read a poem on the wall. I neither knew the title nor I could find out the author of it. So I learned the first line by heart and tried to find something out after school.
The part I read yesterday follows.
Read it and find out whether you like it or not.
(Unfortunately the text is in German ;))

Yours,
Chrissy