I've been in the community 5yrs now. And I've seen a little bit of everything.
This is my favorite one so far:
A, B, C write paper, submit to his pal D.
D appoints E,F,G as reviewers.
C, and E were in school together.
F was a C student.
G sends the paper back to C to auto-review it.
C cannot be bothered, so delegates the review back to A.
A reviews his first name paper.
(poor phd student B doesn't even know)