unorthodox openings

Rather then the tried, tested and rejected 6...Bg4 7Re1 Be7( 7...f6?8Kxe5! Bxd19 Kxc6+) 8h3 Bh5 9g4 Bg6 10 Kxe5 .

the game continues like this

7 Re1 0-0 8 Kxe5 Qh4

The most scary openings:

Frankenstein-Dracula variation, Vienna opening:

Four knights opening, Halloween gambit

I have won a game as Black in just 14 moves like that.

Actually Black is in deep trouble in that line:

Grob gambit 

Does it really come down to just how you define "unorthodox"? Personally, I wouldn't call the likes of the Von Hennig Schara gambit, Winawer Counter Gambit and Fajarowicz gambit unorthodox. They are more a rare visitor when you get to a certain level of play.

Then again, you should not confuse unorthodox with out right junk. The Omega Gambit for instant. From the stable of openings "invented" by Chess's answer to Harry Mudd.  This particular piece of "snake oil" simply throws a pawn away for little or no compensation.

This one was even played in a world championship, twice (Petrossian-Spassky, 1966, both draws): hippopotamus defense

Jerome gambit:

Sicialan defense, Accelerated Paulsen/Quinteros Variation

Caro-Kann, De Bruicker defense

Caro-Kann defense, Fantasy variation:

Caro-Kann defense, Hillbilly attack:

Caro-Kann defense, bayonet attack

Caro-Kann, Gugernidze counterattack

I did a thread about bad openings. Check it out

https://www.chess.com/forum/view/chess-openings/bad-openings-thread

I'm currently quite fond of the Bird (1 f4).  It forces people to play 1 .. d5 (or King's gambit as black) which they aren't 1 d4 players familiar with the Dutch puts them on unfamiliar territory.  Generally does the main job of the opening: gives you some good moves and gets you into a sound middle game.  Works well.  When I've lost it is to players who likely would have beat me anyway.  

For learning purposes going to be doing more Italians and Roys but this is clearly my favorite unorthodox opening.