Which episode of Scrubs is this?

Carla is worried she has messed up Izzy's life for some reason so Turk tells her she is the most amazing mom he's ever met so she says "that is the sweetest thing you've ever said to me... This will come back to you in a good way" Then later Turk and J.D. throw water balloons at their interns while they act like spaceships and one of the interns uses her annoying voice to make the sound of the mothership. Turk learns Spanish for Carla's anniversary present but decides not to tell her just yet, she later finds out and forgives him for keeping it secret because of the sweet thing he said to her at the beginning of the show.