I can't really say that I had a challenging client because clients are always right. I have had some irate customers that wanted to yell the entire time we were on the line, but I didn't yell back. I didn't meet them. I made them meet me with my tone. I kept a well-even tone, and by the end of the call, they were apologizing to me, saying, it's not you we're mad at. We're just mad at the previous customer service rep. I understood. I was able to help them resolve their issue, which meant that they didn't have to call back in again.