Was doing A3 once and as soon as we start the other healer (a miqo scholar) makes a joke about me being an evil WHM lalafell and that I would probably get everyone killed. Well on last phase after messing up a +- tether she get floored (so satisfying) so I use swiftcast, stop a second to think, and cast a big evil Medica 2...she spent the rest of the fight eating dust of course.

Also not really a healer thing but once in a Bismark farm, I was using weather macros to warn the rest of the party in last phase...after a few clears my brain decide to stop working and I use a rain macros during a wind weather and watch while 5 people happily stand on the border of the platform ready to perform the leap of faith....at least they learned an important trust lesson.