It's sometimes useful to re-read documentation of the software you use regularly. I, for one, tend to take the easiest path and use just the bare minimum features. Take for example the magnificent little Unix program called screen. I have been using it for — I don't remember how long — at least 10 years. The basic commands and key bindings are second nature for me, but though I've known about window splitting, I've never actually used it. Now I do.

What's more, there are often gems like this in Unixy applications and utilities:

 nethack on|off
  
 Changes the kind of error messages used by screen.  
 When you are familiar with the game "nethack", 
 you may enjoy the  nethack-style  messages which 
 will often blur the facts a little, but are much 
 funnier to read. Anyway, standard messages often 
 tend to be unclear as well. This option is only 
 available if screen was compiled with  the  NETHACK
 flag defined. The default setting is then 
 determined by the presence of the environment 
 variable $NETHACKOPTIONS.
 

There are loads of weird old options that dealt with wacky terminals, but most of the stuff is still relevant. (Well, maybe dealing with wacky terminals is still relevant, beats me.)