Teacher: "What is an OS? And give me an example."
Student: "An OS is a word which can be used instead of saying 'Oh Yes'. For example, do you like ice cream? You can reply, ‘Oh, yes' or 'OS.'
Teacher: "You may sit down now."
Patient: "Doc, I am very stressed out and I am not getting proper sleep at night."
Doctor: "I am giving you some medicines and sleeping pills."
Patient: "Is this going to help?"
Doctor: "Yes, just give it to your wife before going to bed."