Have you ever goofed off in the classroom or in past jobs?

The interviewer wants to know if you will take the job seriously. McDonalds puts a lot of time and money into on-boarding new staff. There is a difference towards being a goofy person and goofing off. If you take your work seriously and have a proven track record, tell your interviewer. It's also okay to admit that you like to have fun at work but you understand that having a job is a big responsibility.