You were working at a pizza place and were delivering pizza. Walden had ordered pizza and you were delivering it. You didn't know it was Walden's house, you didn't know who Walden was. You knock on the front door, Walden opened it and was looking at you as you handed him the pizza. (He had paid already). Walden was looking at you, he was thinking about how cute you were and how to get you to stay somehow.