Uncle Sam pointing: I want to protect the information in YOUR computer. https://i.imgur.com/e0a67w9.jpg
Santa shooshing: He does not give away PASSWORDS. SHOULD YOU? https://i.imgur.com/ZZDXBBn.jpg
Pirate and Spy: Pirate or Thief? Respect Copyright. It's the law. https://i.imgur.com/Oa8DDeU.jpg
And I took screenshots from that PDF of my favorites:
Magician pulling rabbit out of hat: No Trick to Security. It's Just Common Sense. https://i.imgur.com/9EvTtsI.png
People with safe dials in their mouths: Put Security Where Your Mouth Is. https://i.imgur.com/WAbAEuM.png
Hot pink poster with James Dean in a sultry pose with his arm draped around a safe: Up tight and out of sight. (I'll refrain from cracking any safe sex jokes!) https://i.imgur.com/dBv13kU.png