Yes to the poos at work. Plus leave the loo in a mess afterwards, preferably with a small puddle of wee around the base.
In meetings, either (a) don’t pay attention when women are speaking so that at the end you ask a question that’s already been explicitly answered by at least two women there, but not understand why they are suddenly rather stony-faced; or (b) when a woman has made a point but no one has responded, make it again later in the meeting as if it’s just occurred to you. For bonus man points, you can actually do both in the same meeting!
At a working lunch, when the sandwiches arrive, immediately take four of them without checking to see if that leaves too few for everyone else in the room.
Wonder aloud periodically why some of the female colleagues in your office are just so uptight and always seem to be angry, you know? They don’t seem to smile very much?
On the day your child is due to go to another child’s birthday party, appear 20 minutes beforehand annoyed that no-one’s waiting at the door yet, and then ask where is the party and assume someone else has bought a present, got child ready, etc.
Twelve hours before you are due to go on a family self-catering holiday with children, come down the stairs with a small gym bag full of pants, and say derisively, “Well I’m all packed, I don’t know why it’s taking you so long?”
I’m sure other mners have some other fab ideas for “living as a man”….