Sometimes I feel that no matter what I say or how many times I say it, students can too easily tune me out. That is why I sometimes assign videos that simply reinforce what I say in class. Or, just play the videos in class to introduce, supplement or replace lecture on the topic. In my experience, it is an opportunity to break the monotony of lecture; to have students look up from their laptops (I require that laptops be closed when a video is being shown) and increase the possibility of engagement.
The video below is not particularly interesting or exciting in and of itself, but it accomplishes the desired break in lecture - and the mountains are nice to look at.