This thread is awesome...
I dare you to shower/bath with a diaper on and let it soak up heaps of water, Dry yourself off and remove as much of the water as you can from the diaper with just the towel you used to dry yourself, make sure you shower just before you go to bed. Continue with your usual bed routine and go to bed with your diaper completly soaked
Extra: Drink 2 glasses before you go to bed and wet the already soaked diaper.
I'm not good with giving dares, Hope its a good one though
Imma TB when my parents aren't home :P