& @ufail
 
  Syntax: @ufail <object> = <message>
  Attribute: Ufail
 
  Sets the message that someone sees when they try to use object but
  fail the object's use lock.  Note that the other functions 
  controlled by the use lock (paying, listening, and $-commands) do 
  not trigger Oufail.
 
  Example: 
  @ufail robot = The robot pointedly ignores you.
 
  See also: @aufail, @oufail, @use