class _{static{int j=0,i=(int)(3*Math.random()),q[]=new int[][]{{3,7},{7,10},{5,21}}[i];for(;j++<q[1];)System.out.printf("%."+(q[0]=q[0]*8%13)+"s%s\n"," ","Foo # :-:".split(" ")[i]);}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).