I wonder if there's a trope, or should be one, for show titles that get shortened by fans. Could be trivia, maybe YMMV. I know there's tropes like "Fan Nickname" (which I guess would be closer, I haven't looked at that trope in awhile, can't remember if it actually exists or if I'm subconciously thinking it does now) and "Title Confusion".
I'm not talking about how fans abbreviate titles, but titles that are common for fans to use that are shortened. For example, fans might add numbers to sequel titles that didn't have numbers and ignore the subtitle (I've heard many refer to Ace Venture: When Nature Calls as Ace Ventura II, and I as well as others I know have often referred to Austin Powers: The Spy Who Shagged Me as Austin Powers II, with most of us referring to Austin Powers: International Man of Mystery without the subtitle, and Austin Powers in Goldmember as just Goldmember).
With the many Super Mario Bros. games, outside of The New Super Mario Bros. series of games, I usually don't refer to the "Super" part of the title, and usually drop the "Bros." part if it's there (the main exception being Mario Bros., to create a distinction between that and Super Mario Bros., which many people refer to as just Mario). I just refer to the original trilogy as Mario (sometimes "Mario 1"), "Mario 2", and "Mario 3".
With game systems, growing up it seems like nobody I knew referred to the Nintendo Entertainment System as NES (which is more common today, for both me and people I know). We'd always just called it "Nintendo", and when the Super Nintendo came out, I think we sometimes called it "regular Nintendo". Of course with all the Nintendo systems since the Game Cube, me and others tend to drop the Nintendo part of the title (and we tend to replace "Nintendo" with "the", as in "The Game Cube", "The Wii", "The WiiU", depending on how I'm referring to it I might use "a" instead of "the"). Back in the heyday of the Sega Genesis, hardly anybody I knew ever referred to it as just "Genesis", but we often did call it just "Sega", while I would refer to the Sega Game Gear as just Game Gear (and would properly refer to the Sega CD as a Sega CD). I remember one time, somebody asked me what game systems I had, and I mentioned Sega (as in Sega Genesis) right before mentioning Game Gear, then thought it sounded like I ommitted mentioning Genesis.
Additionally, if a show is title "The (title) Show", people tend to leave out "The" and "Show" (TV listings tend to do this as well), and "The Adventures of..." tends to be dropped from titles that have that part of the title. I've often referred to Tiny Toon Adventures as just Tiny Toons, Mister Roger's Neighborhood as Mister Rogers, Pee-Wee's Playhouse as Pee-Wee, Lamb Chomps Play-Along as Lamb Chomp, WKRP iN Cincinnati as WKRP, and so on.
I wonder if a page like this could get too out-of-hand, or if it's too "People Sit in Chairs".