Douglas Carswell, UKIP's sole MP, got into a bizarre Twitter argument about what causes tides.

Carswell, who is renowned for being vocal online, decided to pick a fight on Monday night with someone who said, correctly, that the Moon is mainly responsible tidal movement. The staunch Brexiteer claimed it was actually the Sun.

The man who Carswell called out was Paul Nightingale — a professor in science policy. Nightingale immediately pointed out the MP's fairly massive factual mistake, but Carswell stuck to his guns and continued to argue anyway.

Here is the surreal exchange in full:

The entertaining exchange didn't go unnoticed, and quickly got picked up by lots of baffled Twitter users.

—The Mushy Pea (@TheMushyPea) September 20, 2016

—Harm van der Gaag (@HarmvanderGaag) September 20, 2016

Carswell really is an intriguing man. Business Insider has been keeping a close eye on speculation that he is paid in gold nuggets by companies who advertise on his blog — an accusation he is yet to deny despite numerous chances to do so.