I used to work at a Mexican restaurant in AZ about 3 years ago. Before I worked there, I would've never guessed how tiring the work can be. I could not sleep the first night because my feet hurt so badly. I went out the next day and bought super lightweight black shoes.
Also, I learned the value of tipping well at restaurants. Nothing worse than when cheap ass patrons would leave the few coins they got as change as your tip. .47 cents? Thanks!