Late night writing. I cannot emphasize how much of a difference is made in the right pen when it comes to writing.
Any pencil feels unfinished; a cheap ballpoint pen gives you an uneasy hand. You struggle against the stiffness of the ballpoint, rather than working in unison to achieve what you want to write. Nowadays I always, always travel with 3 pens... 2 when one of them (soon) runs dry. The Pilot G-2. Pilot Precise V5, and lastly for fancier touches the American Crafters Metallic Gold Marker get my jobs done. Gold? Because there's just something about gold, is why.
For more tips on making sure you've got the "write" tools for writing, definitely check out this blog The Write Gear, in which you can really learn about the most reliable notebooks and pens to get you on the write track. Remember, writing is a passion, a process of being and relaying your genius to a paper-- it shouldn't feel stuffy.