LOL I know what you mean...Sassy does that too. She'll stand still until I get right up on her and then she does the play with me bow and runs like a mad woman!
Yesterday she took a toy outside..one she KNOWS she's not allowed to take outside. I was trying to get her in the house and she was ignoring me and making me chase her (whiich I'm pretty sure is what she wanted in the first place)...so finally she got under the chair and stood perfectly still...as if she thought I couldn't see her. She would only move her eyes to 'find' me. It was pretty funny.