The fact that interviewing for software engineering jobs tests skills that are mostly unrelated to software engineering. Related: interviews that are SE relevant, but in no way apply to the job at hand.

Example: I was asked by a 50 person company to “design the Twitter home page/feed for the world.” Relevant to SE, sort of... I mean, who designs massive distributed systems themselves without being able to consult colleagues or the internet? Relevant to a 50 person company? I suppose they wish it was....