Here’s a post on Metafilter about papers posted to the arXiv on April Fools’ Day. They’re all from the physics section, but a couple are of the basically-maths sort of physics.
I had a look at the maths section for any papers with bizarre titles published on the 1st of April but I couldn’t find anything. A missed opportunity!
I did find a computer science paper with the title “Worst-Case Robust Multiuser Transmit Beamforming Using Semidefinite Relaxation: Duality and Implications,” which looked to me like something produced by a Markov chain paper title generator but it seems to be a serious paper about something or other.