I've been teaching for ten years, and I've picked-up a few tricks. The animated presentation of "moving your face" along with dramatic use of voice really works in my classroom. As I speak to a class, I interact, I ask questions, and I deliver compact bursts of information when I know I have students attention. I usually relate a story, a historical fact, or some odd aspect of knowledge which can be tied to the subject material. In many ways this method could be described as acting much like an animated storyteller. I find story elements act as a mnemonic device. I helps lock the raw information in a fixed position in students minds. The associated information is retrieved if they remember the story. The animated facial expressions and timbre of voice help keep their attention to both story and information. If I look around the room and see "sleeping" students, I grab their attention with a question, a look, or a gesture, or a start yelling out information randomly. The "llama" gag works in the same regard. My students look forward to the random elements, and even a photo of a llama might tie itself back into the presentation as a story or relatable element. Stunts of this nature really help keep dry information entertaining. Within a Powerpoint presentation, the "breaks" a llama slide can provide can be used to separate subject material. Thus it can act as a mnemonic device in recall as well.