Troi: Have you ever been for a real moonlight swim? Data: One can swim in moonlight? Troi: How about you, Mr. Worf? Worf: Swimming is too much like... bathing.
Enterprise is on its way to the planet Pacifica. The crew plan on taking some R&R on planet which is known for its nice beaches and water. Troi is looking forward to swimming. Data is, as always, confused. Worf....is Klingon.