The Big Bang Theory - Back To The Future Grammar

In this video clip, the gang from The Big Bang Theory discusses the movie "Back to the Future 2" and Sheldon and Leonard argue about the use of the correct English grammar to use in describing the events.
Gramar constructions such as "Have Has Had" and "Had Will Have Placed" and "Had Have Had Brought" make absolutely no sense in English yet are funny because they poke fun at English grammar.