I have a big pet peeve — when a speaker begins their presentation by asking the audience a question. Something like, "Show of hands, how many of you....blah blah blah?"
Has any great speech EVER started off this way?
No. No it hasn't.
It's a tired gimmick that's intended to make the speaker look like they care about the audience, are good at being "interactive", or have a clever point to prove.
It doesn't work, and if you choose to start this way you're wasting those precious first few seconds. The few seconds where the audience is deciding whether or not they care about what you have to say.
Start by saying something that matters. Something you believe with conviction that will make people sit forward in their seats. Authentic stories laced with values will always trump contrived introductions.