"""
    function eyes()

Evil-looking eyes

# Example

```jldoctest
julia> cowsay("Mwah, ha, ha!", cow=Cowsay.eyes)
 _______________
< Mwah, ha, ha! >
 ---------------
    \\
     \\
                                   .::!!!!!!!:.
  .!!!!!:.                        .:!!!!!!!!!!!!
  ~~~~!!!!!!.                 .:!!!!!!!!!UWWW\$\$\$
      :\$\$NWX!!:           .:!!!!!!XUWW\$\$\$\$\$\$\$\$\$P
      \$\$\$\$\$##WX!:      .<!!!!UW\$\$\$\$"  \$\$\$\$\$\$\$\$#
      \$\$\$\$\$  \$\$\$UX   :!!UW\$\$\$\$\$\$\$\$\$   4\$\$\$\$\$*
      ^\$\$\$B  \$\$\$\$\\     \$\$\$\$\$\$\$\$\$\$\$\$   d\$\$R"
        "*\$bd\$\$\$\$      '*\$\$\$\$\$\$\$\$\$\$\$o+#"
             \"""\"          \"""\"""\"
```
"""
function eyes(;eyes="oo", tongue="  ", thoughts="\\")
the_cow =
"""
    $thoughts
     $thoughts
                                   .::!!!!!!!:.
  .!!!!!:.                        .:!!!!!!!!!!!!
  ~~~~!!!!!!.                 .:!!!!!!!!!UWWW\$\$\$
      :\$\$NWX!!:           .:!!!!!!XUWW\$\$\$\$\$\$\$\$\$P
      \$\$\$\$\$##WX!:      .<!!!!UW\$\$\$\$"  \$\$\$\$\$\$\$\$#
      \$\$\$\$\$  \$\$\$UX   :!!UW\$\$\$\$\$\$\$\$\$   4\$\$\$\$\$*
      ^\$\$\$B  \$\$\$\$\\     \$\$\$\$\$\$\$\$\$\$\$\$   d\$\$R"
        "*\$bd\$\$\$\$      '*\$\$\$\$\$\$\$\$\$\$\$o+#"
             \"""\"          \"""\"""\"
"""
return the_cow
end