What's a time your opinion really mattered?

To think about something such as this off the top of my head is kind of hard. It is really difficult to pick out one thing that stood out to me when my opinion really mattered. One that has just happened recently to me is the situation with the roommates i currently live with. We have a set schedule for me and my roommates to do the dishes throughout the week. When one of them decided to not do theirs on their day i got fed up with it since it was a reoccurring thing. I told them straight to their face to get their act together, since i knew they were doing it on purpose, and start acting like adults and do their dishes. Since this was happening frequently i was becoming more and more stressed with my schooling since it got on my nerves so much. But atfer i said what has been building up for so long, it felt great that i got it off my back. Since then my roommates have done their dishes on time, and no longer wanted to see that side of me anymore.