The perfect trap for Cady Karter is to lay out a Freeze Collar that says DON'T PUT THIS ON.

Then I label the magic freeze button DON'T PUSH THIS BUTTON. She can't resist. Now I have a freeze device on my little step-sister! Lots of freezing/unfreezing, including pranks! Water pranks! Bondage pranks. Cutest freeze scene ever, Cady hates it!