I.e what behaviour makes you or those around you know it's time to stop/leave?
I'm a harmless, happy drunk. Annoying at times I'm sure, but I just lose inhibitions and become over friendly, probably a bit loud and giggly.
I've only very rarely been ill through drink and when I have, every time, it's been preceded by a period of sitting on laps.
If I sit on a lap, send me home 
Can I say, this is intended to be lighthearted ahead of us (hopefully) getting back to big nights out. What's the point when you know you've had enough?