Write and debug a computer program, create a Web page or a wall mural for your school, complete a project in science, automotive technology or building-trades class, or conduct a study of the history of veterinary medicine in your community. If you're young or can't find the right internship or summer job, think about volunteering. Call organizations dedicated to helping people or to making the world or community a better place. Volunteer some time at the local animal shelter. Help out at a legal aid society, or work on a political campaign.
Some people flip burgers.
Some bag groceries or bus tables. Others clerk at the mall, or file and answer phones in an office. Perhaps you've been a camp counselor. You may have done babysitting or tutoring. The job may not be in your career field, but it's experience.