A bad dev habit I should unlearn?

How about being too stubborn to take an idea out back and put it out of it's misery. You know what I'm talking about. Got some elegant idea in your head, it looks so pretty and masterful. You begin to implement it but straight away, things start looking pretty fucking ugly. You persist though, and persist.

Sooner or later that pretty idea looks like Donald and Hillary decided to spawn a love child. You close your eyes and grit your teeth, unwilling to put the abomination out of it's misery.

You stop and finally open your eyes to look at what you've done. A hideous beast with Gary Johnson's nose, Bernie's voice. Donald's hair, and Hillary's lips stares back at you. Yeah. Now you've wasted hours upon hours and only have a mistake worse than the 2016 American Presidential Election to speak for it.