I am working in web development. I've recently started a new job at a small firm of 4 people. I'm the most senior person in terms of age and experience, and report to the CEO, who is younger than me.
The CEO makes an irritating noise while stirring his coffee, which distracts me. He bangs the spoon rapidly against the edges of the mug for about 40 seconds.
How can I ask my boss to stop doing this as it's noisy and distracting?