In which Harry Potter book do they first visit the kitchens?

Question:

In which Harry Potter book do they first visit the kitchens?

I read them all, but long ago, and now two of my friends are arguing about which book it was in. I told them I forgot, but I could find out for them.

Best Answer - Chosen by Asker: I believe it is in Harry Potter and the Goblet of Fire, when Harry, Ron, and Hermione visit Dobby in the kitchens. Then Hermione becomes obsessed with helping house elves and creates S.P.E.W.