@OFail <OBJECT> [= <message>]

The ofail message, prefixed by the player's name, is shown to others
when the player fails to use <object>.  Without an argument, it
clears the message.  <Object> can be specified as <[*]name>,
<[#]number>, ME, or HERE.  An ofail message on a group is displayed
to other players in the room when a player is removed from the group.

An @ofail on a player tells the player who is trying (but failing)
to page them.

@OFAIL Green Box = tries to steal the green box.
  displays to players in the same room as Olaf:
Olaf tries to steal the green box.
  when player "Olaf" tries to "GET Green Box"

see also: @fail, @osuccess, groups, locks, substitutions