What is your least favorite opening?

I hate king indian defense

Kings Gambit, French Defense and as White Nc3 Dunst.

While there are certain openings I refuse to play from one specific side, whether that be as White (King's Gambit, London) or as Black (Benko, Alekhine), there are two openings I totally despise playing from either side!  They are:

1) Grunfeld Defense

2) Sicilian Dragon*

* Normal Dragon, not Accelerated Dragon.  I'll gladly go against the Accelerated Dragon and have transposed to it through the English Opening.  Absolutely no problems with the Maroczy Bind!  Of course, I only deal with the White side of this.  I tend to avoid the Sicilian as Black.

I dislike symmetrical lines.

London, when someone plays 1.d4 2.Bf4 against me I hate him inmediately, I want him and his family to suffer and get a painful death, as I consider him a bad person

QGD, London System and Ruy Lopez. doesn't get more boring than that.

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The Scandinavian defence (when I'm playing as white). Every time someone plays it against me I celebrate, especially in blitz and bullet games. Its not a bad opening in long time control chess but every move requires some degree of calculation and it usually leads to at the very least a significant time advantage (if not a material advantage) for white.

1. g4

Oh boy...

Ok, maybe I exagerated a bit, just a bit.

1...f5 is weak against 1.f4.  There are literally 4 moves that 1...f5 is no good against (Source: Play the Dutch against 1.c4 and 1.Nf3 - Don't recall author)

Those 4 moves are:

1.e4 and 1.g4 - Obvious Reasons

1.Nc3 - 2.e4 gives White a significant advantage

1.f4 - the Gambit line here is much stronger than the From's Gambit is for Black.  2.e4! fxe4 3.d3 - Advantage White

The author of that book argues that the Dutch is playable against any of the other 16 moves by White.  Not sure I agree with that, in particular 1.b3 and 1.b4.

I hate playing against the Black Lion.

my least favorite opening (excluding those oddball openings of course) has to be the sicillian, while I can play against it, I hate the positions that arise from it... Which is why I play Nc3 as white and go with the flow from there :)