If I could meet one person from history, I'd like to meet the person--the very first person-- who noticed/thought of the phrase,
"you know what it means to assume, right? Just makes an ass out of you and me."
It could be that many people have made this discovery separately, individually, unaware it was already a thing. "Guess what I just noticed!" It might be that the actual first person doesn't even know they are the first person because surely someone had thought of this already. I think about this a lot, actually. Who was the first person to come up with that? And do they know that they did? They deserve to know. The whole world does too.
Which is why I'd like to find out who it is and meet them. First, to let them know it was THEM. That it was on this date, that they were doing this and that and that they were actually the first. And second, to shake their hand.