Do Not:
Stand in front of the barrier looking for your ticket in your handbag. I will walk into you, possibly hurt you, and not care.
Walk through the barrier, and then stop so everyone else walks into you (including me; I may hurt you, and I will not care).
Walk without looking. If you do, I will 'accidentally' hit you with my handbag which, last time I looked, contained a makeup bag, a big, old iPod, a novel, a hardback notebook, 3 pens, a large set of keys, a wallet full of 30 year old receipts, a car key, 5 lip balms, 3 half-eaten packets of Extra chewing-gum, one packet of Smints, £34 in loose change, and a mobile phone. It is therefore Heavy, and will Hurt.
Sit on your fat arse eating McDonald's when there are two very old ladies who need a seat, otherwise they will die and it will be your fault.

Listen to piss-poor dance music (probably made by you at home on your 20ft Powerbook, the capacity of which you barely understand), at top volume on your B&O headphones, the quality of which is so fine that we can hear every nuance of your bizarre sub-Midfield Generals rip-off
Eat food with your mouth open.
Have a REALLY LOUD 'amusing' conversation with Charlotte, held solely to attract attention. I know you are trying to attract attention because every time you laugh, you look around the carriage.
Change carriages while the train is moving, slamming the door loudly.

Get in my carriage and play a guitar and sing. I will kill you.
Pick up your child and walk around with some white heather and mutter at me. I won't do it. Go away.
Get on the tube if you smell of wee and have a hole in your trousers through which your cock protrudes. These days, I choose the cocks I look at wisely and well, and yours is not one of them.
Walk onto the platform and stand still at the entrance with your other Swedish friends and your suitcases.
Ask me if I know where the Piccalilli Line is. Piccalilli is a kind of weird yellow relish, not a tube line.
Talk about me in French. I was once bilingual. I will understand you, raise my head as you start talking about my shoes, and fix you with a cold blue gaze. Then and only then might you realise that some English people speak more than one language (not many, admittedly, but you get my point), and fall in to an embarrassed silence.
Pay for a £3 tube fare in 5p coins on the big machine that takes credit cards and that everyone wants. Use one of the small ones, made for people like you.
Try and sell me your one-day Travelcard.
Use your mobile phone. Admittedly only possible on a few Tube lines, as not all of them are Underground, but - just don't. Please.
Play a tambourine.
Do a saxophone solo to 'Baker Street' and expect anyone to give you any money, ever.
Stand two abreast on the escalator.
Open your paper in my face.
Read my book/paper/letter over my shoulder.
Get on the tube in the summer if you are not clean.
Touch me. In any way. Even if I am dying.
Kiss in a way that shows the world your tongue revolving like doner kebab meat on a stick.
Do:
Use the bus, walk, cycle, get a taxi, drive, get a boat down the Thames or fly with your own arms.
Use the tube if you have an IQ of over 150.
Get an Oyster card.
Work from home.
Not work from home.