1- Very Long Publication Time
The longest publication time I have seen is > 13 years, in the journal [Linear Algebra and its Applications] where the paper Received 14 June 1995, Accepted 8 May 2006, Available online 8 October 2008.
Article Generators of matrix algebras in dimension 2 and 3
2- Very Short Publication Time
The shortest publication time I have seen is > 23 days, in the journal [Journal of Solid State Electrochemistry] where the paper Received: 25 April 2014, Accepted: 7 May 2014, Published online: 18 May 2014.
https://link.springer.com/article/10.1007/s10008-014-2510-3/fulltext.html
3- High Number of Authors
The highest number of authors of one paper I have seen is 5000 authors.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.191803#fulltext
4- Very Long Paper Title
The longest paper's title I have seen is 88 words.
Article ACC/AHA 2007 guidelines for the management of patients with ...
5- Very Short Paper Title
The shortest paper's title I have seen is 1 word.
http://cshperspectives.cshlp.org/content/3/1/a006833.full.pdf+html
6-The highest Number of Self-Citations
The Highest Number of Self-Citations I have seen is 40 out of 49 references (82%).
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/7954/1/Novel-approaches-for-high-efficiency-InGaN-quantum-wells-light-emitting/10.1117/12.875901.short?SSO=1
7-The lowest Number of Citations
The lowest number of citations (References) I have seen is 0 (Zero).
The references section was written as: No references on this topic seem to exist and no useful results could be found.
https://dl.acm.org/citation.cfm?id=323274
8-The biggest number of references (1778)
The biggest number of citations (References) I have seen is 1778.
Article 3D printing of hydrogels: Rational design strategies and eme...
9- Non-Human co-author (Cat)
A paper published in Physical Review Letters contains a cat ( F.D.C. Willard) as co-author
Article Two, Three, and Four-Atom Exchange Effects in bcc 3He
------------------------------------------------------------------------------------------------------------------------
*NB 4 and 5 are added based on the bellow comments.
Do you have such strange cases??, If so please share them here.