"Mom! Write "battle arena". Now write "sword". Now write "knight"."Paddy goes off to play, then comes back.
"Write ninja. Now write pirate".
In case you were wondering about the outcome-- after some battle sounds, he soon came back.
"The pirate beat the ninja. There's a sword lying on the ground."
A few minutes later:
" Now write troll. And dragon. And horse. Oooh, this story is getting interesting, isn't it!"