This morning, daisy_knotwise
put Katie on the toilet when she woke up. Nothing happened, so after a bit, Gretchen got her down and put her pull up on. About fifteen minutes later, Katie announced that she had peed a bit in her pull up, so Gretchen put her back on the toilet and we were rewarded with a bowel movement that actually hit water. :)
As a reward, Katie got the "Dora Saves the Crystal Kingdom" Wii game that I'd bought several weeks ago for an occasion such as this. Unfortunately, it turns out that an hour of helping Katie play the game will make me motion sick.