My current pitch is as follows:

``` markdown
Active Record is awesome. It handles all this complexity under the hood by making use of Arel for SQL generation. Most of the times, Rails developers don't have to know about how Arel works. But sometimes Active Record can't satisfy our needs. 

In this talk I will walk through the code containing complex handcrafted SQL and its Arel alternatives. Arel allows us to express SQL in database agnostic way by using powerful predicates to build objects and collections. So keep calm and ride on Arel.
```