A diagram. Its caption says “Figure 1: Get me off your fucking mailing list.” and the diagram itself is a simple flowchart consisting of the nodes “Get” “me” “off” “Your” “Fucking” “Mail” “ing” and “List”.
Link to Get me off Your Fucking Mailing List (2005) by David Mazières and Eddie Kohler, originally accepted for publication by the predatory International Journal of Advanced Computer Technology. Proof of acceptance and “peer review” here
This wasn’t actually published in the journal as nobody ever paid the fee to have it published, and considering its contents I’m not sure if it actually fits, so feel free to remove. It’s also the only academic paper I personally know that fits here that I haven’t had trouble tracking down, and I wanted to share it with anyone who might not know of it yet.