Ever since walking racism machine Donald Trump announced his presidency and plunged us into some sort of dystopian hellscape timeline, he hasn't really been clear on any policies except one - he wants to build a bloody massive wall on the border of the US and Mexico.
This is a big problem, and as John Oliver has expertly shown, it just gets bigger as it unravels.
Thanks to a little bit of digging, John has found that Trump's little idea will cost big, big bucks and will essentially be a financial black hole.
In addition to that, it probably won't even make a difference. Great.