So about 4 or 5 years ago, I would fax purchase orders to a local H-D dealership to buy parts. It was kind of a pain to constantly fax, then call to verify they got the fax since I had a thousand other things going on. So what I'd do, especially if I was on hold and stuck on the phone, was to draw something on it. This would make the guys there more eager to keep checking the fax machine for my orders... and get my shit ordered right away, which I think worked pretty well.
Funny thing is Little Brandon, who worked there at the time, actually SAVED all the best ones he liked and handed them to me a few weeks ago. Here they are: