Example of LaTeX code that does not compile [duplicate]

In the excellent answer by egreg to the question How Does Latex Know the Page Number of a Reference he said that

[t]his is not completely foolproof and there are examples around of cleverly written documents that never stabilize: each new run of LaTeX will change the page number associated to a label so it never remains the same. However, the chances that this happens in a real document are pretty small.

Does anyone happen to have such an example of source code?

I see how this works and I thought about this several times, but I was not able to simply create a document where this happens.

• – user4686
Jan 21, 2016 at 19:40

\documentclass{article}