These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
And You Thought It Would Fail: On paper, the Undertaker gimmick should have been a giant flop. A satanic 7 foot tall wrestling zombie. How could it ever work when the WWF was still using Hulk Hogan as its backbone to market a family-centered product? How could the WWF go from Hogan talking about vitamins and prayers and then show Undertaker's speeches about coffins and body bags? And yet it worked.
In WWE's defense however, considering the legacy of The Streak (Triple H, Shawn Michaels, Kane, CM Punk and Ric Flair are all on the list of the defeated) almost any way of ending it would probably result in an Anti-Climax.
Base Breaker: Not him, so much, but "The Streak." The IWC was pretty split between those that enjoyed the streak and want Undertaker to retire undefeated (at Wrestlemania, of course) and then those that had grown tired of The Streak because it's taking away the spotlight from younger superstars. And then, just in that second group, one's liable to get just as many opinions as people as to who should have that auspicious privilege. With Shawn Michaels having ridden off into retirement, it's only gotten worse.
Now that Brock Lesnar is the one to have broken Taker's streak, the IWC is even further fractured.
Broken Base: The American Badass/Big Evil gimmick. Most think that it was a new, creative spin on what seemed like a limited character, or it completely ruined The Undertaker, and made no sense.
Smackdown Vs Raw 2006 had a storyline finish with The Undertaker chokeslamming Eddie Guerrero into a casket. Two days after the game's release, Eddie was found dead in a hotel room.
One of the most uncomfortable examples of this ever is in SVR 2007, where 'Taker feuds with another wrestler while playing up the supernatural part of his character and tells the other guy his own persistence will be the end of him, and his family and friends will have only him to blame for the bloodshed. That other guy was, of course, Chris Benoit.
Jeff Hardy had a storyline with The Undertaker in the 2008 edition; around the time the game came out, his house burned down and he lost everything (including his dog).
Any time he's wrestled someone who later died probably counts, given that his gimmick is centered around death. There was at least one time where he was in a fatal four-way with the British Bulldog, Owen Hart and Yokozuna (for those who don't know, out of these four, Undertaker is the only one still alive). Rest in peace, indeed.
Undertaker's absence on the Monday Night Raw following Owen's death despite most of the roster being there to pay tribute was specifically to avoid one of these.
Holy Shit Quotient/I Have the High Ground: Just try to keep your jaw off the ground when he suicide-planchas over the top rope. Keep in mind this is a 6-foot-10, 300-pound man running full speed toward the ropes, and diving over them headfirst. He pulls one out every WrestleMania.
And still doing it well into his 40s.
During his Inferno Match with Kane at Unforgiven 98, he did it onto Kane and an interfering Vader over FIRE!
Internet Backdraft: Go on a forum and state that you feel The Streak should end. Go ahead, do it. Now go ahead and roast the marshmallows on the flames.
In fact, say anything bad about 'Taker in general. Just about the only thing most people will give you are that his best days are behind him, and even then it better be said with a respectful tone or else they will jump down your throat.
Just Here for Godzilla: "The Streak" is getting close to this level, as a few smarks nowadays say "The rest of the card looks like its gonna suck. I'm just here for Undertaker anyways." Now granted, more often then not they usually end up eating their words when it comes to the rest of the card, but it still technically applies.
Especially with the last few WrestleManias, the Undertaker matches have outshined all the others.
The worst case of this was his last WrestleMania victory, WrestleMania XXIX: CM Punk vs the Undertaker. The general consensus was that the match was an instant classic and stole the show. The issue is, well...there wasn't much of a show to steal.
Memetic Badass: Both in and out of Kayfabe, to the point where simply just looking him in the eye without flinching gives you uberBadass points.
Memetic Mutation: Theodore Long: "NOW HOLD ON JUST A SECOND, PLAYAH! Tonight, you're gonna go one on one with...DE UNDATAKAH!!"
The crowd reactions say it all every time that gong goes off. The entire arena practically explodes. Few sounds in WWE today will get that kind of a reaction. Fewer still can say they've been getting it for twenty-two years straight. Taker started getting cheered by the fans in 1992, and even when he formed the Ministry in 1998, he was still getting cheered because the fans loved him as a face or a heel. And when the gong went off again in 2004 at Wrestlemania XX after nearly six years away? Forget it. The Garden let loose with a response we haven't heard for him since, though that's not for lack of trying.
Narm Charm: Seriously, it can not be exaggerated just how silly The Undertaker's gimmick is. And it works, just because it's played so straight.
Older Than They Think: AWA briefly had a mortician Undertaker gimmick of their own and he had Mean Mark pushing his caskets. Brother Love's original plan for the WWF was to bring him in as a murderous monster called "Cain" but Vince wanted him to be a wrestling zombie Undertaker. Unbeknownst to brother love or Mean Mark, Hulk Hogan was a supporter of Calloway's that may have helped convinced Vince to keep him around and may have given him the Undertaker idea since he had been in the AWA prior. The Cain gimmick seems to have been recycled in Kane.
Special Effects Failure: Not too often, given that you can only expect so much out of WWE effects-wise anyway. However, one glaring example was at a recent WrestleMania when they tried to make it look like Undertaker was 'levitating' to the ring. A camera angle from above revealed he was standing on a moving board, the fog in his entrance wasn't thick enough to hide it.
Then there was the botched pyrotechnics at the Elimination Chamber PPV. Undertaker suffered 1st and 2nd degree burns when the fire in his entrance lit his Badass Longcoat on fire.
Which will probably lead to a number of flame wars over this being part of his gimmick.
The wig he wore upon his return in 2012 was a study in hilarity.
Though not necessarily "special effects", one match against John Cena during his Badass Biker phase involved Undertaker riding his bike out to the top of the ramp...and the bike stalling. He spends a few seconds trying to play it off and casually restart the bike, which he can't. Cue several minutes of awkward staring between him and Cena before he gets up off the bike and stomps toward the ring.
The WrestleMania XXVII match as well. Kayfabe or not, it was just depressing seeing The Undertaker barely able to get out of the ring, even if he did win the match.
Kayfabe would've involved druids and chanting and blue lighting and fog. This was not kayfabe.
And now, the ending of the WrestleMania XXX match. It doesn't help that the camera also pans to the audience's shocked reactions.
They Changed It, Now It Sucks: People had differing opinions on the Bikertaker gimmick. Though the "Big Evil" time period of said gimmick is seen a little more positively by most of the Biketaker detractors.
Took The Bad Gimmick Seriously: Though the gimmick would sound silly at first glance, it was perhaps Undertaker's sheer devotion to it that makes it work so well.
And it's not just him, either. The fans absolutely adore the undead version of Taker, to the point that when he came back as The Man From The Dark Side in 2004, every fan in Madison Square Garden came off their feet in absolute jubilation at seeing this much-beloved version of Undertaker return. The fact that it seems to be back for good just adds to it, as Taker claimed the main reason he went back to this particular version of the Undertaker gimmick was due to how much it meant to the fans.
Uncanny Valley: Undertaker makes use of this trope as part of the psychological warfare he plays on his opponents. Rolling his eyes back, sitting up right after taking a huge bump and appearing to impervious to pain are all things which make him appear inhuman.
Visual Effects of Awesome: Awesome as far as anything in professional wrestling can be. His entrance itself, the occasions where he shoots lightning at people, his symbols that spontaneously combust, among other things. It doesn't matter if it's fake, his kayfabe is still awesome.
X-Pac Heat: The low point of Taker's career was probably in the early 2000s, during and for a year or two after the InVasion angle. During the InVasion Taker refused to sell anything and looked bored and like he'd rather be anywhere else. It didn't just extend to WCW wrestlers though - in one incident he wrestled against A-Train and no-sold everything, just a week after Kane had Worfed all over the ring to help build A-Train as a monster. The X-Pac Heat came and went until Taker took a break and then came back with his original gimmick instead of as the American Badass.