What do teachers do off duty?

I'm not even so sure how I got to think about this, I guess it was in some random subject when some random teacher was being incredibly rigid and unreasonable about something dumb (whatever it was, they do it so often I lose track). So what exactly do teachers do with their free time? Quite obviously they go to the staff room for breaks, but what do they do in there? As much as I'd love to believe they have a secret bowling alley that pops out of nowhere with the press of a button, or maybe even an indoor swimming pool for some water aerobics though this might not be 100% true. Unless of course the schools budget is seriously out of balance in their favour, but this would mean they wouldn't be so on-edge and grumpy all the time, right? So I have concluded that this is what they could possibly be doing instead:

1. Making coffee (Caffeine free of course, wouldn't want them to have any stimulants!)
2. They then drink only half of the God-awful coffee mix, and leave the mug to stand on their desks for a minimum time period of 2 weeks, or until it grows a beard.
3. Mark test papers, I assume this takes up crap tons of time.
4. Complain about how today's kids are not made how they were used to.
5. Plot ways in which to make lessons less user friendly and boring (If that's even possible)
6. Complain about how boys haircuts determine how well they do in school and how the colour of girls hair does the same.
7. Moan about low pay, even though they drive decent cars...