Leave it and come back later

I found this is especially useful when I'm stuck at somethings. Rather than sitting there scratching my head and feeling miserable & stupid, I would stand up and walk away. Come back later (reasonable amount of time, of course) to solve the scalp scratching problem. :)

I do this for when I'm playing jig saw puzzles as well. Viewing the puzzle from a different angle and height make a big difference!