If you get unwanted or strange results, don’t dismiss them right away.
Ask yourself the question “Can this be used for something?” If it might, take notes of all the parameters so you can reproduce this result whenever you want. Think of it like experimental cooking, if you find something great you save that bunch of steps and ingredients and give it a name. If you don't, this rare event will be lost again.
By the way, this does not only apply to science and cooking. Think about this in everything you do.