It shows how programmers get buried in a paradigm. When I wrote lots f functional programs, my procedural programs started to look functional - even though it didn't make a lot of sense for the language. That's how C or Fortran programs can start looking like bad Lisp.

It's the same for other paradigms. When I was writing lots of logic programs, I tended to write lots of logical functions in procedural languages, even though it didn't make a lot of sense. Lots of recursion, which tends to be really inefficient without tail-recursion optimization.

Right now, my primary language is Java. And I really, really dislike lambdas in Java, because they are a poor imitation of actual lambdas expressions in pure functional languages.