We're still having trouble with Punky and the potty training. She just pooped in her diaper and I told her that I would buy her a bunny (we just went to a local petting zoo and she fell in love) if she would start using the potty all the time. She was crying and whining and I said, "Mommy will buy you a bunny if you use the potty. Big girls use the potty."
To which she replied in tears, "Babies use the potty, too!"
I guess reverse psychology doesn't work, either.