This quote from Kernighan should be at the top of any C++ guideline: "Everyone knows that debugging is twice as hard as writing a program in the first place. So if you're as clever as you can be when you write it, how will you ever debug it?"

Writing supposedly smart code seems to be a weird culture thing in C++.

I've lost count of the number of C++ devs I've worked with that get the "Mmmm, donuts!" reaction to templates, and leave a stinking pile for everyone else to debug. I'm sure I'm included in that group of programmers, but I hope, not as much.