Insane autolink, i.e. the link text is the same as the link address:
The website http://example.com is cool. See also:

\Q[http://example.com/2]
which renders as:
The website example.com is cool. See also:
example.com/2
Exact parsing rules described at: Section 5. "Insane link parsing rules".
Note that the prefixes http:// and https:// are automatically removed from the displayed link, since they are so common that they woudly simply add noise.
Equivalent sane version:
The website \a[http://example.com] is cool.

\Q[\a[http://example.com/2]]
which renders as:
The website example.com is cool.
example.com/2
Insane link with custom text:
The website http://example.com[example.com] is cool.
which renders as:
The website example.com is cool.
Equivalent sane version:
The website \a[http://example.com][example.com] is cool.
which renders as:
The website example.com is cool.
If the custom text is empty, an autolink is generated. This is often useful if you want your link to be followed by punctuation:
The website is really cool: http://example.com[].
which renders as:
The website is really cool: example.com.
This could also be achieved with the sane syntax of course, but this pattern saves a tiny bit of typing.
Link with multiple paragraphs inside it:
\a[http://example.com][Multiple

paragraphs]
which renders as:

Ancestors