There used to be a lot more of these stand up and slurp ramen shops, but for some reason I haven't come across many lately. Taro-ken (高円寺ラーメン タロー軒) in Koenji is a classic if you want a quick slurp. And they're cheap!
The set menu (ramen and half curry) at 800yen is the most popular.
The ramen though is an average old school shoyu with a little too much saltiness.
And the noodles were a little too pretty for this soup, but I wouldn't mind coming back here. After all, they are open 24 hours.
Taro-ken's curry was good too, but I prefer mine green.
Now this is the way it should be.