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Case in point: A speaker who says "Write this down!"
When someone says "Write this down," I instinctively refuse to write it down. I think I know enough about myself, my needs and my interests, that I can determine for myself what notes to take during a presentation.
I get that this speaker is trying to make sure he has my attention, just in case I'm drifting off as he gets to one of his main points, but telling me what to do is not the way to get my attention back. If he's lost it, there's a reason, and he might want to explore his other speaking techniques before barking orders at me.
Be very careful with gimmicky approaches like "Write this down," or "How's everybody today? I can't HEAR you!" and similar patronizing remarks. Audiences don't want to be manipulated. They don't want to be yelled at. And they don't want to be treated like five-year-olds.
Treat me like an adult; assume I'm able to make good judgements for myself based on my lifetime of knowledge and experience. Find better ways to get and keep my attention that are relevant and engaging, not artificial and stagey.