In Pandaria, when you get to the Valley of the Four Winds, one of the quests you can pick up is "Li Li's Day Off". Li Li is a snarky little Pandaren, the niece of Chen Stormstout, and when Chen runs off to investigate an abandoned brewery, she asks you to help her see the sights in the valley. As part of the quest, you get Li Li's Wishing Stone, which lets you summon her whenever you get to a sight she wants to see. You will be tempted to hit a point, summon her, then dismiss her so you can be about your business.
Don't do it.
If she's accompanying you as you perform your other quests, she makes some amusing and truly, deeply snarky comments about the situations and things you encounter.
I liked Li Li when I first encountered her on entering the Valley; as time goes by, I'm just growing more and more fond of her.