I've been rejected from a (startup) job because I did not, they claim, appear to be sufficiently enthusiastic about the product.

At the time, I found it doubly strange, since it was one of the most interesting and useful products I'd seen, and because everybody I met at that company had the energy of a Steven Wright monologue drowning in molasses.

Since then, the company appears to have pivoted pretty severely (new business plan, new logo, new offices, etc) so I'm not sure any of it would have mattered at all. Hiring in software is completely broken.