The common scenario between the two is that at first they appear to be friends, but eventually butt heads, argue over the subject for a period of time often blowing it out of proportion.
Jeanette isn't brave enough to stand up to Brittany.
Brittany: Guess I'll have to read this.
Brittany: You can make all the Chipmunks meeting the Beatles. Is there an episode of the jokes you want, Alvin.