Usage: yell <text>
  
The text is sent to everyone in your room. In addition, it is sent to anyone
in adjoining rooms. This is useful when trying to find someone who has become
lost. When searching for a lost soul, have them yell continuously. If you are
near them, you will receive a message looking something like 'So and so yells,
I'm over here!'.

Yelling also tends to attract monsters to your room as well as irritate those
monsters already present. Beware! (Note; yelling without specifying any text
can be used as a tool to increase monster encounters, if that's what you're
after).
