When people get to know each other well generally they begin to open up, perhaps become more animated, broach subjects previously off limits, share more personal details.
When people get to know each other really well they start arm wrestling, play naughty Twister, have piggback races and bodyslam one another.
The Pink House currently home to a number of long-term residents who have known each other long enough to allow indulgence in the odd intimate caper. Thus, last night was Body Twister night where coloured blobs on the floor were replaced with body parts. Each contestant, then, labels up parts of their body with sticky numbers and hopes to be touched, or not to be touched there.
Some were braver than others, and whilst I stuck my number 1 to my belt buckle, Richie went the whole way and stuck it on his crotch. Meanwhile Goonie had stuck a number 5 on her tit, and so it wasn't long before I had someone's hand on my arse and my hand on someone's tit.
The evening ended with a piggy back race round the Potts Point fountain in full view of the Police Station.
There's also a rise in bodyslamming and pile-ons over the past few weeks. This usually involves waiting until someone is asleep before doing a Shirley Crabtree and belly flopping on their sleeping form. If you've organised it properly, there should be a queue of people behind you waiting to pile on and, as person after person dives on the next, the effect is a kind of human lasagne.
Occasionally it can go wrong. Last week, a decision to bodyslam Raj whilst he was asleep in the TV room resulted in Aidan taking a blow to the cheekbone. After scrambling out from amongst the pancaked, collapsed scrum, we saw his eye was cut - very much like a boxer. Within minutes a frozen bag of peas was strapped to his face to get the swelling down.
Throughout this an ageing Belgian couple had looked on aghast at such childish behaviour. But then again, they live in Belgium - I don't think they have much exposure to excitement.