Hi all!
So I initially did this ink on paper drawing for my wonderful friend Mary last summer in 2014:
So some background here: Mary LOVES Batman. We both finished up our EMT class together and her sister-in-law was about to have a baby. While her sister-in-law was in labor, the nurse tried to give her extra oxygen via a nonrebreather mask without prefilling the reservoir bag (you need to prefill the bag with oxygen, or else that patient is just breathing their own CO2), and Mary totally called her on it. I thought it was absolutely hilarious, and had an epiphany for drawing a Batman-inspired comic version of the story. Recently, I decided to make a poster out of it for the EMT classroom, and so I re-did the piece in color on my computer with Sketchbook Pro:
Hope it makes you laugh! (And this goes without saying, but I obviously do not own anything Batman in any way, just using the idea for educational and/or humorous reference)