I tried to write a poem on this theme for Sunday Scribblings, but it didn't work so here's a list instead:
leaving school and the friends you made there
the moment of first leaving home
a goodbye kiss to your partner on the way to work
walking out of an unliked job
relief as a difficult colleague hands in her notice
fond farewells as a friend leaves town
the last look at the place of your 'once in a lifetime' holiday
relief of leaving the 'hotel from hell'
uncertainty on leaving your country for two years abroad
sadness on leaving the country that had been home for two years
ridding your mind of thoughts of someone who haunted you
mixed feelings of leaving a lover gone cold
Sadness on the death of someone well loved
An elegiac farewell to a life and love now lost
If you're being kind you could read that as a list poem, but for those who would rather read a real poem, luckily on Crafty Green Poet, I recently re-posted a farewell to a species - Passenger Pigeon.