The instructor will draw the bonding MO of dihydrogen without accidentally causing laughter in the class or self embarassment.
chalkboard or whiteboard
ability to adjust quickly just in case
I have come close to accidentally drawing the incorrect version of this diagram and I am able to stop myself quickly as illustrated in the instructions.
When I do this correctly, the students don't accidentally see something which may make immature students giggle.
I have had multiple colleagues tell me that this technique worked for them and saved them from repeating an embarassing classroom event.