I took some little animal toys and put them in a bowl of water in the freezer. When it was bath time last night, I took it out and gave it to Jack. First he dunked it to get the ice to come out of the bowl.
He eventually poured water over it to get the rest of the animals out. He had the best time doing this, and he has requested that I freeze "Daddy's guys" (aka Jay's Homestar Runner toys) for tomorrow's bath.
I think that when it is colder I am going to put some dinosaurs in the mop bucket and freeze it outside. Then he can have an iceberg that will last a while!