We all hope for nice clients who pay well and communicate clearly, but sometimes we end up working with people who are very difficult. These bad experiences can be stressful, yet they often teach us how to protect our business in the future. For example, a person might learn to use better contracts or ask for payment upfront because of a past struggle. Looking back at your worst working relationship, what is the biggest lesson you learned? Please share your story and how it helped you grow.