I'm really curious on what type of builds are out there that upset people off. For me its gotta me teemo mage. . .but than again any game with teemo is annoying. Once you get your main items:
You just run around planting love all over their jungle and get them to chase you. . .if they fall for it. More AP the better.
full ap bard support. he just got 3 items and my adc lost the right to lane.
(
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I had a friend go thornmail teemo against a full AD team and start BMing the enemy team in all chat. So they got all angry and decided to repeatedly 4-5 man top lane, essentially giving him a free global taunt while he was stacking full armor. It took a solid minute to run him down and kill him too, and we literally took their inhibs while they got a couple kills on him and top lane outer.
/
.. makes you so annoying to deal with rarely lost a 1 vs 1 or even a 1 vs 3 with that build
with 
. Rakan's kit lets you proc censer a ton during fights anyway plus the extra procs on your entire team with the Locket, then you can pretty act like a tank with the knight's vow tied to either the ADC or an assassin.
Bruiser Yasuo. 
With Warlords. You know, the one that gave increasingly more lifesteal the less health you had.
Most annoying fucking shit ever. Towers? What are those? Yasuo would ask that question every game with this build as he promptly ignored your towers and dove you with zero repercussions.
I just really don't enjoy playing against any form of AD Garen. It very rarely if ever wins games, but playing against it just feels so frustrating because once he silences you if you are a squishy it's over. He dies immediately thereafter and doesn't make too much use to his team, but my god is it a tilter to just have a Garen run you down. It almost feels like he's just sacrificing himself to make sure you can't contribute.
AP Varus
or 
http://i.imgur.com/ktJfjqv.png
http://i.imgur.com/PwQgkjQ.png
Max % health damage feels good. I grant the build is a little under 1000 AP short of the images without Elixir/Dragon/Baron Buffs, but R>auto>E>auto>Q shreds 99% of enemies 100% of the time.
Teemo Support.
Best vision control in the game bar none, higher damage than the adcs until late-game, can meme the enemy adc with a blind, Shrooms still hurt like hell, and now the global taunt is on the Support instead of the carry.
Resourceless Soraka
Has a really cumbersome build path, but once you finish Warmog's with your tear in tow, you practically become resourceless, which is pretty nasty on a champion that can heal 200 health on a 2 second cooldown. (Before cdr)
Split-push Janna
https://youtu.be/MC0hV3dea9g?t=36s
Upgrade a minion near your base, race to the other side of the map to plop down a Zz'rot portal within turret range, then run back to join your team as the enemy team is forced to choose between a 4v5 and losing their tower.
, i auto attacked you, out played.
Tank/Bruiser Akali. She doesn't die and she can still kinda oneshot a squishy (this was before the assassin update)
It's a core item on him but Frozen Mallet Gnar. You kite immobile champions for days.
Jumpscare Jarvan (RIP ADC)
One of the most annoying things I have ever faced was PD IE into full tank Yasuo.
I don't know what the most annoying build I've ever faced was, but recently I played against this:
And with his passive, he still got decent AP. This just gave him maximum CDR and made him really difficult to kill.
It was kind of awesome.
AD soraka. I have no idea what their build was or why it worked, but Soraka's autos float so slowly, we pushed back an attack, got to our tower, and here comes an auto we barely outran to kill the adc anyways for 250 damage in one hit. It wasn't a bother, she can't heal at all, but it was definitely annoying.
full ap Trynd, it was a ranked and no one understood that even with him building that way, he was doing shittons of physical damage. Only ranked game I have willingly quit.
Seriously nothing compares to this build if you reach late game.
if you have 3 dragons you can easyily break 900 ap 340+ ad
have 40% cdr
a 800 hp shield using archangels and 3400 mana lol.
Building Wormarg's in ARAM. (On pretty much any champ who can get away with it.)
