Anti-dragon cream. Personal guarantee: if you’re incinerated you get your money back, no quibble.’ 'What you’re saying,’ said Vimes slowly, 'if I understand the wording correctly, is that if I am baked alive by the dragon you’ll return the money?’ 'Upon personal application,’ said Cut-Me-Own-Throat.
It has an interesting approach in terms of organizing disk layout. That solves a lot of problems (dependency hell, immutability, reproducibility, automatic changes etc) and seems to be overall better, but it’s a huge paradigm shift and step learning curve so many people get discouraged.