How to lock/slow down keyboard to make it cat proof?

1.    Open System Preferences, then click the Accessibility icon.
2.    Click the Mouse & Trackpad icon in the list at the left.
3.    At the top right, click the Options button alongside the Enable Mouse Keys checkbox.
4.    Put a check in Ignore Built-In Trackpad When Mouse Keys is On, and click OK.
5.    Close System Preferences, then in future when the MacBook keyboard is sat upon by a cat, tap Option (Alt) five times. When the cat has moved on, tap Option five times again to restore everything to normal.