I don't know why I thought of it today...
Back in the day (about a month after I.V. adopted us as her peoples), Bob and Elsie (aka the inlaws) came to stay with us. They had decided that rather than stay in Austin all week, they were going to stay with us for a few days, head down to San Antonio for a few, and then come back to stay with us at the end of the week.
Not 15 minutes after they walked out of the house to go down to San Antonio, I.V. very purposefully walked into the guest room (aka drum room). She then very purposefully walked over the bed to the center. And then she very purposefully popped a squat and peed on the bed.
And for whatever reason, I found it hysterical.
Then I spent the rest of the day washing the bedspread and sheets.