I wrote cowsay in cow
You have to use my fork of the cow compiler.
cowcompile cowsay.cow
./cow.out "hello"
Will output
hello
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
You may have noticed the he does not have any speech bubbles and no command line options. This is because I had already way spent too much time writing silly cow programs to add this. Pull requests welcome.