1. They come in a packs and are loud (it's taken roughly seven years to sync everyone's diaries just for one teeny, tiny night out).
2. They are excitable and wild; this is their one night of freedom, godamit and they are going to make-it-count.
3. They are looking hot: literally, they have just run out the house after sorting out the children/expressed milk/babysitters/dog sitters/husband sitters.
4. They are dressed to the nines with killer heels and lippy, there's also probably a bit of baby vom lingering on a shoulder.
5. The clubs that they once utterly despised now become 'the venue of choice'.
6. Come on Eileen becomes the 'anthem' of the night.
7. They hang around the DJ like a swarm of bees, in heels.
8. They are circled around a jack-the-lad who naively thinks he's in with a chance (despite being young enough to be someone's son); clapping and making him twerk which they find hilarious, like cats pawing at a mouse.
9. One of them will suddenly come out from nowhere wearing a hat that they have stolen from someone.
10. One will be sick, one will cry, one will have to be have carried home, sometimes someone does all three.
11. Without fail, one of them will always fall into the role of being the mother (of all mothers); ordering the taxi, delegating, rounding up the troops and taking charge of the kitty.
12. They fall into two camps: either texting their partner incessantly just to check the dinner/bath/bed routine hasn't been disrupted - or, they are so blasé they appear to have lost their phone, their handbag and their left shoe and they don't care.
13. They become those women they once swore they'd never be: mutton dressed as lamb.
14. One of them is shamelessly trying to break-dance (or trying to be sexy) but in reality, they are basically just on the floor, looking ridiculous.
15. One of them has to run to the toilets as a little bit of wee has just come out after laughing so much.
16. They are the last to leave the dance floor and have to be scraped away, kicking and screaming because leaving means the reality of responsibility.