LOL...I think each one of these has been on a list of "unapproved" items or practices at one time or another, if not outright banned, unofficially, of course.
nintendo/game boy - I remember an Awake! (I think) that all but told "true Christians" to not allow these in the home cell phones - I remember the WTS trying to clamp down on cell phones and text messaging for teens
TV - Oh that Devil box...dubs for decades have bemoaned the worldiness that prevails on the boob tube. Funny though, most of em still have one
Movies - Here in the States, R-rated movies were pretty much banned. They even made a push to keep dubs away from PG-13.
Computers - Well, we all know you need a computer to access the Internet (except for that short lived period of WebTV) and, of course, the word Interent is ancient Hebrew for "I love Satan and Obey Him at all Times"
Alchohol - I posted on the alcohol thread how I was told that we should abstain completely...and the WTS has some pretty strong language about over-drinking, but I've noticed that alcohol abuse is pretty rampant in the congregations.
motorbikes - this one is a weird one. some dubs ride em, some think that they're wrong, but I couldn't find anything against them in the publications years ago when I bought one. I got looked down on by some dubs, but I remember one elder saying he wanted one, but his wife wouldn't let him...so much for headship in that family arrangement
pagan wedding traditions (white dress, exchange of rings, hokey pokey dance, cans behind the getaway car ..etc..... - yep, can't throw rice...that's pagan, but by golly we'll wear a ring and wear white and veils
boats - There was a couple of brothers that bought boats in my congregation one time and then when the CO came through he gave a scathing talk about material possesions and how you become slaves to them. Then he used boats as an example...you have to keep them maintained and cleaned...and since we lived some ways away from water, you have to either take a Saturday to pull it to the lake and enjoy it or spend money and have it stored at the marina...not a wise use of time or money for a spiritual person. After that all the boat owners were looked down on as "weak".
hunt'n - Hell, owining a gun, let alone hunting created quite a stir where I'm from. Some of the old country folks owned guns and hunted, the new city slickers took the WTS at their word and said "no guns, no hunting". Since the elders were mostly city dudes, the dubs who owned guns and hunted had to do it on the downlow
fishing - Isn't fishing hunting? You're hunting water creatures instead of land creatures. Except where I grew up, where hunting was wrong, tons of dubs fished. It was never even questioned. Brothers got trips together to go the coast to rent charters to fish in Gulf stream waters. One elder, in giving a talk on the New System, said that even though we would be vegeration, we would probably still eat fish, because we all liked it so much
karaoke - Karaoke got a bad rep in our area. The best I can remember, some dubs went out to a karaoke bar, had fun, but something happened. Somebody got drunk or somebody got loose, I can't remember the details, but later in a local needs part, karaoke bars were deemed havens for worldly vices and that true christains would avoid such places. So after that karaoke was out for our congregation