Topless Skull. Why topless?

Have topless skull ... 

Have moonroof ???

Give me your reason to have a topless skull

                    ,;~'             '~;,
                  ,;                     ;,
                 ;                         ;
                ,'                         ',
               ,;                           ;,
               ; ;      .           .      ; ;
               | ;   ______       ______   ; |
               |  `/~"     ~" . "~     "~\'  |
               |  ~  ,-~~~^~, | ,~^~~~-,  ~  |
                |   |        }:{        |   |
                |   l       / | \       !   |
                .~  (__,.--" .^. "--.,__)  ~.
                |     ---;' / | \ `;---     |
                 \__.       \/^\/       .__/
                  V| \                 / |V
                   | |T~\___!___!___/~T| |
                   | |`IIII_I_I_I_IIII'| |
                   |  \,III I I I III,/  |
                    \   `~~~~~~~~~~'    /
                      \   .       .   / 
                        \.    ^    ./
                          ^~~~^~~~^ 

image from comment section of Diesel Sweeties through this link: 

http://www.notcot.com/archives/2010/12/holiday-giveaway-21-diesel-swe.php