Getting high on my own (pedagogical) supply.
I often, in the midst of planning for a course, get so excited about how the activities I introduce will go over with my students. I think about what they might come away with at the end of the class / semester, how they might feel about the concepts I introduce and what needs to be in place to ensure relative safety (sometimes things like reflection essays, for example, can bring up strong emotions among students, so I like to build-in contingencies to address this possibility). I also often do not think of myself as another beneficiary (participant - yes, beneficiary - not necessarily) of the outcomes I hope my students end up working with.