When my daughter was almost four and a half (!!!) I bribed her to potty train with the promise of a fabulous 'Dry Panty Party'. She had to wake up dry for 30 consecutive days to earn a special party complete with new underpants as decorations, a diaper toss game, a 'put the turd in the toilet' game and lots of toilet themed cupcakes. A good time was had by all and she still sometimes writes 'Dry!' on the calendar to this day.