Too subtle do you think?

Just been making my youngest son's birthday card ready for next week.
Every year I try to make something topical and in the past he has had archery, quad bikes, bowling, guitar ...

This year the outside of his card says
"Hope your birthday is full of ... "

and the inside says
"Surprises!" and shows the picture of the sparkling clean room.

Or maybe I should just do the usual yelling
"GET THIS TIP CLEANED UP!!"

What do you think?