I want to see all the different ways you can come up with, for a factorial subroutine, or program. The hope is that anyone can come here and see if they might want to learn a new language.

Ideas:

• Procedural
• Functional
• Object Oriented
• One liners
• Obfuscated
• Oddball
• Bad Code
• Polyglot

Basically I want to see an example, of different ways of writing an algorithm, and what they would look like in different languages.

Please limit it to one example per entry. I will allow you to have more than one example per answer, if you are trying to highlight a specific style, language, or just a well thought out idea that lends itself to being in one post.

The only real requirement is it must find the factorial of a given argument, in all languages represented.

Be Creative!

Recommended Guideline:

# Language Name: Optional Style type

   - Optional bullet points

    Code Goes Here

Other informational text goes here

I will ocasionally go along and edit any answer that does not have decent formatting.