Well, we all knew it was coming, but here it finally is: Brexit Day. Prime Minister Theresa May has triggered Article 50 of the Lisbon Treaty, which formally begins the two-year process of Britain leaving the European Union.

Merry Brexmas.

The referendum in June 2016 saw 52% come out in support of leaving the EU, around 17.4million people. So not everybody is happy about Brexit because, after all, 48% of voters, 16.1 million people, wanted to stay in.

And some of those people aren't taking Article 50's triggering very well.

The philosopher AC Grayling is adamant that it's not going to happen because, as the old thought experiment goes, if Brexit takes place but an academic refuses to accept it, does it really happen at all?

Others took it just as badly.

Clocks went back 46 years last night. Woken up in 1971. Brexit Britain will be poorer and greyer

— Kevin Maguire (@Kevin_Maguire) March 29, 2017

#Brexit will be disastrous for UK. Tories will blame "intransigent EU" not their stupidity. Tory media will back them up. How it will happen

— Marcus Chown (@marcuschown) March 29, 2017

I am European. That's how I see myself. Brexit wasn't just an idiotic act of political self-harm, it was an attack on our identity. Sad day.

— Matt Haig (@matthaig1) March 29, 2017

"Now is a time to stop complaining that we've shat the bed, and instead all learn to live together, respecting each other, in a shitty bed." https://t.co/NqtKjE8wMS

— Hugo Rifkind (@hugorifkind) March 28, 2017

☹️ #BrexitDay pic.twitter.com/ttfK18YpB6

— Joe Le Huquet (@joelehuquet) March 29, 2017

And so the UK begins its long & pointless journey, leaving EU friends behind. #brexit pic.twitter.com/x1VKNOC8kL

— Tony Addison (@TonysAngle) March 28, 2017

But at least old fashioned British gallows humour isn't dying with the country's membership of the EU.

Article 50 day is finally here. Shoutout to all the leave voters who have died of old age since June

— Fred Delicious (@Fred_Delicious) March 29, 2017

How are you going to celebrate Article 50 Day? I'm going to pour some raw sewage on a beach and buy a very high wattage lightbulb.

— David Whitley (@mrdavidwhitley) March 29, 2017

Happy #BrexitDay everyone pic.twitter.com/fcfT5PCS1W

— Majere (@CmdrMajere) March 29, 2017

Do you know what Brexit is? It’s your dad, in the car, refusing to ask anyone for directions.

— Emma Kennedy (@EmmaKennedy) March 29, 2017

#brexitday what could possibly go wrong! pic.twitter.com/ENSQPMLTeu

— Stewart Lee (@stewartelee) March 29, 2017

"I had to trigger Article 50. It would have been too embarrassing otherwise."
"So you're going to leave the EU... out of embarrassment?" pic.twitter.com/GplKt8VwLk

— Scott Innes (@Flying_Inside) March 29, 2017

Good morning.
Today is the day when Britain triggers Article 50 and starts negotiations to leave the EU.#Brexit. pic.twitter.com/0rYXCL1voe

— James Melville (@JamesMelville) March 29, 2017

Some people are finding solace in art.

And I don't even know what this is, but they're clearly big fans of the EU.

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