What is the programming religious argument that bothers you the most?

"Convention over configuration" is something that is used as a mantra in our office; and when you follow a "mantra" at the cost of a developer's productivity, this is what pisses me off.

As someone has said it right: "It is not the religion that bothers me, but the group that forms around the religion". What pisses you off, and why?

One more is "Premature optimisation is the root of all evil"... citing the phrase people don't even give a rat's a** before writing code, and what we end up with is really poor performant code at the end, to pick up and clean all the shit that these developers leave behind.

What do you think?