Heard from across the classroom:
Student: MRS. BUTLER! OH MY GOD!!
Me: (said nothing, maybe a quick pants check...)
Student: YERTLE AND BUDDY HAD A BABY, AND IT'S A FISH!!!
Which is funny because A) Buddy and Yertle are turtles, and B) because I forgot to tell the kids I'd added feeder fish to the tank over the holiday break. Oops. ;)