Ada peed on Rick while he was holding her in her bath towel after a much needed rinse in the shower upon returning from a day at the beach, which just so happens to be the worlds largest sandbox in which Ada learned that she doesn't, in fact, like to eat sand and when she does eat sand, she throws it up on the beach for all of the volleyball players to see.
That's it. That's all I've got. Hence the "highlights"... pee and vomit. What more could you ask for?