Most websites about movies are total garbage (SELF-DEPRECATION), but here’s one that is not garbage: The Parallel Universe Film Guide, via VSL. It’s a wiki-style database for imaginary movies, along with profiles of the imaginary actors and imaginary directors who made them. It’s basically every drunken late night party game session you’ve ever had, but organized alphabetically and searchable. Some of my personal favorites are Poor Little Incredibly Rich Boy (1941) about a newspaper tycoon who dies with no regrets, and Fun with Child Endangerment (1990), which is basically Home Alone, but with car-jacking.
You can create your own account here, and enter your personal variation on the “oh man, you know what should be a movie” meme.