Feeling manipulated!

Last night, around 9:30, I was helping Robby do the dishes, and watching Dancing with the Stars (yes, both can be done, that's what commercials are for!), when Charlie comes out with this pitiful look on his face. He says "Mom, I'm scared." So immediately I go and take him back to bed, and talk to him about why he is scared. He tells me that he is scared that spiders will think that the web is real and will make it their home (Robby and him put up fake Halloween cobwebs around his window earlier that night). So I shut his blinds, tell him that spiders won't make it their home because they didn't spin the web themselves, and lay down in his bed with him. We get all snugly and comfy, then I look at him, and see the biggest grin ever on Charlie's face. I ask him why he is smiling, and he tells me that he is happy. I ask him why he is so happy, and he tells me "Lets just rest Momma, lets just rest." But I needed to know what made him so happy, because I had a feeling. So I ask, "Charlie, did you tell me a lie about being scared of the spiders, just so I would come and lay down with you?" His face was so precious, with this half grin, saying yes. I couldn't believe it, but I couldn't be mad at him either. How does he know how to do that already? He is almost 4, but still I would never think that Charlie would be able to come up with that all on his own. Little stinker butt!