I like to think that John is a doodler, especially when he was a sergeant and would draw penises and what not on his Captain’s very important paperwork(which would earn him a slap to the head).
Now that he’s grown up and more stressed out, he’ll sometimes take a quick break from reports to doodle on a sticky note or on the corner of some old paperwork that he(won’t) has yet to fill out. And don’t let him do it for too long or else you’ll find a spaced out John drawing random shit on any paper available.
(Some doodles)