gistfile1.java

@EventHandler
    public void onSomething(PlayerInteractEvent event){
        if(event.getAction() == Action.RIGHT_CLICK_BLOCK){
            Block block = event.getClickedBlock();
            if(block.getType() == Material.WALL_SIGN){
                if(block.getState() instanceof Sign){
                    Sign sign = (Sign) block.getState();
                    String line = ChatColor.stripColor(sign.getLine(1));
                    if(line.equalsIgnoreCase("Knight")){
                        //do shit   
                    }
                }
            }
        }
    }