Let's read: weird things on arXiv: ponies, particle card games, statistical mechanics of poker

Search "pony" on arXiv, there are two results:

Complementarity of Resonant and Nonresonant Strong WW Scattering at SSC and LHC, Michael Chanowitz (Submitted on 6 Oct 1992), with a comment:

Comments: 8 pages (figures on request by Pony Express), LBL-32938

No-clicking Event in Quantum Key Distribution, W.-Y. Hwang, I.-T. Lim, J.-W. Park (2008)
with the memorable phrase

quantum Trojan-pony attack

I see that arXiv is yet unponified. No matter. Try "card game", magic happens!