It might have been decades since you were last in a classroom, but most of us never forget the teachers who shaped our school days (for better or for worse).
Now - in a climate of increasing cuts and pressure on teaching staff to meet examination targets - former pupils from across the UK have decided to shine a positive light on education.
Simply by sharing a short message of gratitude for Teacher Appreciation Day.
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Whether it is the person who taught their favourite subject, or someone who made them look at the world through new eyes, these teachers really struck a chord.
And helped make them the people they are today.
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Someone pass us the tissues.