A couple of weeks ago Katelyn discovered her finger can go in her nose, quite the accomplishment (said with sarcasim), and of course her daddy grabbed for the camera. (I am sure when she is 16 years old she will love showing this picture to her friends :)
The first time she did it I told her no and to take her finger out...which of course made her want to do it more (basic logic) and she continued to stick her finger in her nose....so when she did it again we just ignored it and didn't say or do anything (other than snapping some pics for the album, of course). The second technique (ignoring) worked much better because she has not done it since then.
I will admit we had a hard time not laughing (which would have made her want to do it more since Mommy and Daddy seemed sooo amused by it).