Sirius Black looked down at the spot where Peter had stood.
"James," he began slowly. "What do you think happened?"
"Well, judging by the fact that you just cast an incorrect animagi spell, I would assume that he became an incorrect animal."
There was a squeak and the two of them looked down. Out from under the bed came a small animal.
"Sirius, I think we've found him."
On the ground, the creature picked up a slipper and started to chew it.