April Fools on the mouse

I have one of those funny kids's in my life.  When the mouse doesn't work for me I know to turn it over and dust it off.  
So today when I turned it over to solve this problem, I found I had been fooled...oh haha
Then when brother sat down in front of the computer..hahaha...he yelled out..Oh you're funny!
I hope this is her only joke.