YAML - Strange and complicated

yaml-examples.md

The YAML spec is pretty complicated, and has alot of edge cases. If your whole document is

--- 
gjsogjsgj:gsdgs:sgdjsjgosdg: 

That's actually valid YAML. In some examples like:

--- 
thing1 
thing2 
thing3: 

The YAML isn't invalid until it hits line 4. Without the last colon, that would be valid YAML.

Here's the spec (it's a heavy read): http://www.yaml.org/spec/1.2/spec.html

And here's a convenient way to check out some YAML examples: http://www.yamllint.com/