Seconded.
Just watched on Netflix with the wife last night. As the movie started, I had no idea what it was about. I think that's the best way to watch it. As it started, I expected it to be a story about a bunch of old farts (like myself) attempting to relive some of their mispent youth. The part you alluded to (Body Snatchers) was a complete surprise and all the more funny as a consequence.