A lot of years ago I was working on a system which was having some tedious technical issues. They were tricky to get my technical head around, and almost impenetrable for the project manager...but they wanted to understand so that they could liaise effectively with the end customer.
We'd been around the block so many times, with much frustration on all sides, but the PM just wasn't getting the detail. As a last ditch effort, I wrote the whole thing in the style of "One day Janet and John decided to build a location tracking system. Can you install a GPS-capable device into a vehicle? John can. See the device get it's position from a satellite...." and so on. I formatted it in 12pt Comic Sans and emailed it over to the PM
(for context, this was around the time that Terry Wogan used to do the Janet & John skits during his morning show on Radio 2)
There was a longer period of silence than I was comfortable with, and I feared that I'd induced a major sense-of-humour-failure. I was a little wary when the PM came over to me, but all was good. They'd been incommunicado so long because they'd been laughing so hard and, thankfully, now completely understood what was going on