Some people just don't find chemistry interesting. (I am not one of those people.) I don't harbor any illusions about class attendance; I know darn well that most of my first-year students are my students cause their parents made them sign up for the class. (I am not an easy science teacher.) Either that, or they are hoping I will let them blow something up. (not a chance!)
Once they're in my room, though, most of them will at least put up with me. Cause I am quirky. And that's okay, cause I am at one with my nerdness. Besides, they pay more attention because they never know what we will be discussing next. For example, I was teaching some number techniques the other day and I found myself singing the Tarantella as I did it. (chances are you've heard it, as it's quite a catchy melody - you can hear it here; the Napoletana version is the most common).
They laughed as I did it in class.... but sure enough, I saw some of them humming when they took the quiz a few days later. Which always makes me giggle.