Everything we say to computers can be expressed in ones and zeros. On or off. Open or closed. Yes or no. Humans (and, indeed, porpoises*) have many more options with which to communicate, but the concepts of “Yes” and “No” are still two of the simplest, most important units in our languages… and yet – sometimes – two of the most difficult to use confidently. This talk is a meditation on communicating commitment and consent; on the impact these two small words can have in our relationships with our work, our time, our colleagues and clients, our loved ones, and ourselves.