Liz told Julia to lose the 'tude.
With more Houseguests suspecting Liz was a twin, the sisters needed to get serious about their game to avoid being exposed.
Rumors flew around the house that one of the alleged sisters was nicer and more approachable than the other, forcing Liz to crack down on her sister in the Diary Room. Liz confronted Julia about her attitude during their swap, saying that she had to adopt a bubblier personality if the two were going to survive in the game. Of course, Julia immediately pouted and told her sister she refused "to act like a dumb blonde."
Chin up, buttercup. You're fighting for $500,000!