They sit on the right side of the car, but they drive on the left side of the road. At least, most of them do.

You can drink with a meal at sixteen when your parents are present, but you have to wait until you're eighteen to collapse face-down in puke in a bar. Good things come to those who wait.

Although a part of the Ireland land mass, Northern Ireland is a part of the United Kingdom state.

Like every other country, Scotland has its share of delicacies from a time many hundreds of years ago when subsistence farming was the best we could do and all we had to eat was dog poo and grass. Unlike every other country, Scotland didn't come up with any replacement dishes in the intervening centuries.

From The Septic's Companion a competitively-priced guide to the life, language and culture of the United Kingdom:

fanny: n female genitalia. This is another word which could leave you abroad and in dire straits. In the U.S., your fanny is your posterior and a “fanny pack” is what Brits decided to call a “bum bag” instead. There’s a neoprene belt sold in the U.S. that is designed to stop snow from entering your ski jacket during a fall. It is marketed under the name “Fanny Flaps.” It is not for sale in the U.K.

The House of Lords is intended to be the emergency escape valve of democracy in the United Kingdom in the same way as guns are in the United States. Difficult to tell which one works better, but guns probably work faster.

Although Britain is on the metric system for almost everything else, human weight is still measured in stones. One stone is fourteen pounds, although pounds aren't used in the UK any more, making stones effectively indivisible.

What else could possibly make sense?

Sure, Britain's metric, but you can't take away the pint.

In the UK, the first floor is the one above street level. The first two-floor buildings were extensions to original buildings, and so at the time it seemed logical to only number the extension floors.

So called because... hmm... your guess is as good as mine.

From The Septic's Companion a famous and yet well-priced work of literature:

fag: 1 n cigarette. In very widespread use. One of the most amusing emails I’ve had concerning this word was from an American who had arrived at her company’s U.K. offices to be told that the person she was looking for was “outside blowing a fag.”

From The Septic's Companion a seemingly familiar book:

minger: adj. pron. “ming-er” someone breathtakingly unattractive: She looked okay when we were in the bar, but when I woke up the next morning it turned out she was a complete minger. On fire and put out with a shovel, that sort of thing.

From that bloody book again:

conkers: n a game in which two combatants, each armed with the nut-shaped seed of a horse chestnut tree on a string, take turns to whack the opponent's nut with theirs until one breaks. Yes, it's a little odd. Yes, there is very little skill involved. Let me know if you have any other questions.

spotted dick: n a suet pudding with raisins in it, often served on festive occasions and with custard. And yes, the Brits do use “dick” to mean the same thing Americans do.

shag: 1 v lay (sexual). Usually refers to the act of intercourse itself, except when used by a bloke giving his mates the details about what happened with that tidy bird he pulled in the club the night before. In this case, the term shag should be interpreted to mean anything between a peck on the cheek and a punch in the face. Brits find very amusing the use of the word “shag” in the U.S. to refer to certain dances.

No reference to book, but don't worry. There will be more.

snog: v make out; French kiss: I had a couple too many beers and ended up snogging the bouncer.

Although the Brits are very pleased to be rid of the Americans, they don't celebrate it annually

Although the United Kingdom is a constitutional monarchy, the constitution is not codified.

As Winston Churchill once said, Scotland and England are "two nations divided by a common language". Or was it George Bernard Shaw. And he might have been talking about some other country.

Money left on a bar in a UK pub will be mistaken for an accident and invariably stolen by another patron or returned.

Can't think of anything witty. It's a time of day, for heaven's sake.

Technically it means "national speed limit applies", but this is 70mph on motorways. The reason it doesn't just say "70mph" is because until 1965 there was no national speed limit, and the sign meant "go for it". And, well, signs are expensive.

They're all good, I'd say, so no points for this question. Of course, we each have our opinions as to the best.