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Debian fish thing

char/**/r          
    []="\56\137"      //\\\\\.__
      "\137\40\40"     "\40\40\40"//\\.
       "\40\140"/**     */"\175\\\56\n"//\\.
        "\140\56\40\140\56\137\56\55\55\"\47\40"//\\.
         "\40\140\56\137"//\D\E\B\I\A\N\/\R\U\L\E\S\\\\\\._
        "\137\n\40\40\72\40\40\40\40\40\40\40\40\40\40\40"//
       "\54\40\56\140\55\56\n\40\56\47\56\55\"\55\56\56\40"
      "\40\40\40\40\140\137\137\56\55\47\n\40\47"/*\20*/
     "\"\40\40""""\40\40\40\40\140\"\"\"\47\140\n"//
    ;main(){         /**/printf(r);return(0);}///'
                      ////////////""""'

Compiles with -std=c89 flag

Donut.c

https://www.a1k0n.net/2006/09/15/obfuscated-c-donut.html

             k;double sin()
         ,cos();main(){float A=
       0,B=0,i,j,z[1760];char b[
     1760];printf("\x1b[2J");for(;;
  ){memset(b,32,1760);memset(z,0,7040)
  ;for(j=0;6.28>j;j+=0.07)for(i=0;6.28
 >i;i+=0.02){float c=sin(i),d=cos(j),e=
 sin(A),f=sin(j),g=cos(A),h=d+2,D=1/(c*
 h*e+f*g+5),l=cos      (i),m=cos(B),n=s\
in(B),t=c*h*g-f*        e;int x=40+30*D*
(l*h*m-t*n),y=            12+15*D*(l*h*n
+t*m),o=x+80*y,          N=8*((f*e-c*d*g
 )*m-c*d*e-f*g-l        *d*n);if(22>y&&
 y>0&&x>0&&80>x&&D>z[o]){z[o]=D;;;b[o]=
 ".,-~:;=!*#$@"[N>0?N:0];}}/*#****!!-*/
  printf("\x1b[H");for(k=0;1761>k;k++)
   putchar(k%80?b[k]:10);A+=0.04;B+=
     0.02;}}/*****####*******!!=;:~
       ~::==!!!**********!!!==::-
         .,~~;;;========;;;:~-.
             ..,--------,*/