Flashback city!!
"The paddleboard" was this hard yellow rubber miniature tennis raquet thing, about a foot long it was, that my mom used to have hanging at the back of the fridge back in the 60's. If any of us kids stepped too far out of line she'd threaten to get out "the paddleboard" and whack you with it.
She rarely had to get out the dreaded paddleboard.
Damn that thing HURT.