Monsters in my closet

My daughter is 2 years old and has a very active imagination. The only things my kids watch regularly is PBS (Sesame Street, Word World, sometimes Dragon Tales, Caliou or Arther). We were out of town at my parents for almost a week and got back home last Monday night (late). Tuesday or Wednesday she started talking about monsters in her room. She doesn't get upset, just says there are monsters in her room and continues to talk about them until I (or my husband) go into her to check under her bed and her closet. Once we check everything out the topic is no longer discussed until she "sees" monsters in her room again. I'm not sure where she has come up with monsters in her room, but we think it's funny and cute!