Yay for the day that Evil was born. 
So how about for each hour of the day you celebrate the corresponding year of your life. The very early hours can be spent sleeping since that is what you probably did the most of anyway. However to make it more fun you could wake up every ten minutes and cry and scream. That should scare your mate into not wanting kids for a bit longer. Then you could pretend to learn to talk all over again, throw tantrums, be silly, enjoy potty humor all over again, etc. etc. Then towards the end of the day things can get really fun as you learn how to drive again, graduate high school and then become old enough to drink.
H-here, b-bunny, bunny, bunny...
