4x22 - 3rd Rock from the Sun

When Sally, Harry and Tommy are nearly crushed by a chandelier in a restaurant, they feel reborn, as if they are discovering everything for the first time. Dick is jealous, however, and while Sally and Harry volunteer themselves at a homeless shelter, he strives to have a near-death experience so that he might enjoy life like they do - and a faculty trip into the mountains presents itself as the perfect opportunity. Meanwhile, Tommy decides to waste no more time in his life - and asks Alissa to marry him.