She P's

Last night, I was crouched on the floor, doing some handywork around the house.
Out of the corner of my eye, I see Lisa walk over and stop beside me, almost standing over me.
Before I had time to ask 'Lisa, do you want to go to the toilet?', I hear a waterfall as she semi-squats and shoots a jetstream of pee into her nappy.
I roll out of the way, just in case she tries to 'use the angle'*
She looks blankly at me, and then innocently waddles away with the nappy bulging through her pants.

* A few times, Lisa has managed to position her nappy in such a way that creates a pee-through blind spot.
The first time it happened, it was quite disturbing. A puddle of wee at her feet, yet the nappy was completely dry.