1. Owning enough colouring pencils, rulers, pens, glue sticks, rubbers & sharpeners etc., for a whole class that you bought because your department 'had no budget left' and which you took with you when you left because, after all, you bought them out of your own money. 2. Finding textbooks you took home to do planning from, and forgot you had until several months after you left, and realising it would be too embarrassing to have to drop them into your old school now (not least because they've probably changed exam boards now). 3. Owning other books that you only bought because they related directly to school - eg. behaviour management / subject interest - and wondering if the charity shop can use them because all the teachers you know already have them. 4. Browsing in shops and thinking 'oh, I could use that for'.... and then realising you can't because you don't work there any more - and feeling a bit cheated out of some creative resource-making fun. 5. Finding you explain everything to people in at least three different ways, and then realising that their eyes are glazing over not because they don't get it but because they got it the first time and are too polite to tell you to shut up. 6. Buying an academic diary even though you don't need one any more, because it still fits in with your concept of the structure of the year. 7. Having to pay for your own photocopying now, instead of sneaking in the odd sheet in between department jobs. 8. That weird feeling you get when you meet an ex-colleague and know that in their minds, you are now 'other', and no longer a part of their insular school existence and finding there's nothing much to talk about any more.