It was then I realized that, if I was being truly honest with myself, it's extremely rare that I've ever given a perfect slate of presentations in any given day. Whether I am doing multiple presentations at a conference, or simply delivering multiple versions of the same lecture during the school day, it's extremely rare, if not impossible, that I have ever been able to have a " perfect day ". Inevitably, the first presentation is rusty, and my skills improve gradually throughout the day. If however, I get lucky, I usually end up mimicking myself during the later presentations, which leads to some clunkiness. Additionally, crowds are much different at different points in the day. Early morning classes are still struggling to wake up, while late in the day classes have already mentally checked out. There's usually a sweet spot during the middle of the day, but even that can sometimes be dragged down by post-lunch fatigue. While there's almost always one or two really good versions of it, it's very very difficult to get the same thing two, three, or even four times in a row.
The good news is, that at least over the years I have gotten more comfortable with this reality. It's a presentation is going poorly, I don't stress and assume the day is ruined, I remind myself that it will be possible to make it better the next time around. If the presentation is clunkier than the previous iteration, I am on myself that each audience is different, and sometimes people can learn without necessarily laughing the whole time. It's a lesson that anyone involved in any sort of public speaking can take to heart. Even though you may not have to crowd on your side at the moment, it doesn't mean they are not listening. As long as you know your content, over the long scope of time, you'll be successful in your presentations. It's only when you start playing for laughs, or stepping outside your comfort zone to get attention, that you are really going to lose something.