How do I insert a special entry into a sections list? I want to apologize if I'm not asking the question correctly, but basically this is what I want to do:

I have this craft.entries:

{% paginate craft.entries.section('example').limit(10) as entriesOnPage %}
  {% for entry in entriesOnPage %}
    &lt;li class="class-A"&gt;{{ entry.title }}&lt;/li&gt;
  {% endfor %}
{% endpaginate %}


How do I insert another list-item with a different class that has to always stay in same position. For this example in the 3rd spot, to look something like this:

&lt;li class="class-A"&gt;I'm a title&lt;/li&gt;
&lt;li class="class-A"&gt;I'm a title&lt;/li&gt;
&lt;li class="class-B"&gt;I'm am different&lt;/li&gt;
&lt;li class="class-A"&gt;I'm a title&lt;/li&gt;
....


Once again, I apologize if I'm not using the right terms, but hopefully the code can explain it. 

Thanks!
There's a special loop variable available in for loops which provides info about the iteration.
In your case you'd just insert that list item after the 2nd iteration:

{% for entry in entriesOnPage %}
    &lt;li class="class-A"&gt;{{ entry.title }}&lt;/li&gt;

    {% if loop.index == 2 %}
        &lt;li class="class-B"&gt;I'm am different&lt;/li&gt;
    {% endif %}
{% endfor %}


If you want to do this only on select pagination pages, you'd additionally compare  against the paginate variable available in between paginate tags:

{% if loop.index == 2 and paginate.currentPage == 12 %}