64
I'll give mine to get the ball rolling.
There was a user that, before getting banned, declared that every single living human being alive on Earth right now should not exist because no one had the benefit of a pre-conception device on hand to somehow determine each individual's consent to exist before they started to exist.
I don't know if that take would make David Benatar blush, make David Benatar cackle with glee, or if that was posted by David Benatar himself.
There was a user, like in the first 12mths of the site, who popped up at least twice (the second time with a new account) to suggest the solution to California's water problems should be a pipeline from the great lakes. And they seemed to really thought it was a good idea beyond simple trolling.
And they kept arguing back when people pointed out how that wasn't possibly legally or politically as there's treaties between the USA and Canada. That it wasn't practical in terms of cost or logistics. That it would damage the ecosystem of the great lakes. That California would be fine if they just stopped water intensive crop farming and recycled water (even before considering solar powered desalinisation).
And they weren't like a lib (or more than any of us). Their answer to things like treaties or costs was often things like "well after a socialist revolution there won't be a Canada and USA with those treaties" or "we could build this pipeline with a centrally planned economy" etc
Then their answer would be something like "but under communism we'll have better pipes that don't leak"