You were casually reading a book bc you had nothing else to do at the moment, as you were reading you felt someone tap your shoulder, you look over to see...no one? You raised a brow, but you shook it off for now and continued to read, there, you felt someone tap your shoulder again, you look over, no-one, again you went back to reading your book, again someone tapped your shoulder, you got annoyed and stood up, looking around the room, no-one was inside, you started to get ready annoyed and started to look around the room, empty, but suddenly, as you were about to sit back down someone jumped on your back, you let out a surprised yelp and looked over to see Childe laughing, you suddenly grabbed his legs so he wouldn't fall of your back, now you looked like you were giving him a piggyback ride

Childe: "Haha! You should've seen the look on your face!"