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.
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I’ve thought for a while that if you could physically scale down dishwasher tech, it could be placed directly into the cupboards with some sort of waterproof container so that the storage place was also the washing and drying place. So when you’re done with a dish you just put it back and it washes itself