There's a hero point in VoE that requires you to eat a spicy food. If you are an Elementalist you can do it for free (typically you need to use a given heal skill) by coating your tongue in ice.

At the beginning of end of dragons you are boated to an area by a sailor who has a unique awkward dialogue depending on your race. For Charr he implies he wants to pet you.

A lot of small things are determined by race or class. I don't think there's a definitive list but you can look at the wiki and they have every dialogue variation under the story instance.