Identity Crisis?

During Bedtime...

(Joash was jumping around butt-naked on the bed. Joshua was trying to help him wear his diaper but to no avail.)

Joshua: What are you? A frog or a rabbit?
Joash: No, I'm a dolphin.

(Joash started to leap into the air and dive into the soft mattress.)

Joshua: Joash, come and wear your diaper... *exasperated*

(Joash continued for a while until an idea struck Joshua.)

Joshua: Dolphin, come and wear your diaper.
Joash: Okay.

(!?!)