General

https://www.youtube.com/watch?v=2ZN-zAKIfyQ I never skipped the OP in Ergo Proxy.

[url=http://www.youtube.com/watch?v=nFRx4XyIsAk]Katekyo Hitman Reborn OP 2[/url]
[url=http://www.youtube.com/watch?v=eDU2H7q_sJI]Soul Eater OP 2[/url]
[url=http://www.youtube.com/watch?v=QmK8EiuFKFs]Bleach OP 2[/url]
[url=http://www.youtube.com/watch?v=PkXw1iBgzoY]Death Note OP 1[/url]
[url=http://www.youtube.com/watch?v=ANJTGxUq9gs]Ano Hana OP 1[/url]

[url=https://www.youtube.com/watch?v=U45g-XbI_qw]'CAUSE I FEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEL[/url]

Shingeki no Kyojin - first one

[url=http://www.youtube.com/watch?v=4vt0SyZTuZQ]Nobunaga the Fool Opening 1[/url] (wrong pitch on the song due to copyright stuff)
[url=http://www.youtube.com/watch?v=utFj1J7o1sE]Karneval Opening[/url]
[url=http://www.youtube.com/watch?v=B2JplQgMfis]Rozen Maiden 2013[/url] (pretty much all of them)

[url=https://www.youtube.com/watch?v=Oxn9VHgJM-U]Bleach Opening 9 -Velonica[/url]

[url=https://www.youtube.com/watch?v=_x_H3SAde10]Full Metal Alchemist: Brotherhood Opening 1 - 5[/url]

Naruto German opening https://www.youtube.com/watch?v=d8xoTBZrzko

I always skips them lol

[quote=BRSlove]http://www.youtube.com/watch?v=mUzNLayMrJk&feature=kp

Do I even need to explain why?[/quote]

This OP is way better
http://www.youtube.com/watch?v=o2TO5atI4rU

[quote=DaMeng][url=http://www.youtube.com/watch?v=oUjqlVt6y2A]Baccano[/url][/quote]

Yes! Love Guns and Roses. "Questioning my saxuality"

Anyway @OP besides the Baccano OP, I also really love [url=https://www.youtube.com/watch?v=411JmEtiuss]Masayume chasing - BoA[/url] which finally has the full version released after 3 months of the song being on Fairy Tail

Edit: Almost forgot to mention the new Fairy Tail opening, Strike Back - Back-On. Knew it was Back-On when I heard it. It even sounds a little bit like their song "Chain" that was used as the OP for Air Gear (which was my favorite OP back then).

Someone else already posted the Steins;Gate opening, but one that I really like is:
[url=https://www.youtube.com/watch?v=3nQNSLB3Lpk]Neon Genesis Evangelion ~ A Cruel Angel's Thesis[/url]

[url=https://www.youtube.com/watch?v=cZ7zQbMxm28]Darker Than Black Opening 2 - The Hero Without a Name[/url]
[url=https://www.youtube.com/watch?v=cZ7zQbMxm28]Code Geass Opening 1 - Colors[/url]
[url=https://www.youtube.com/watch?v=aHevv7k286o&list=LL0f-mxPgNU0W9Zl5QhG_dRg]RE:_Hamatora Opening - Sen no Tsubasa[/url]

Oh boy one of these threads again
[url=https://www.youtube.com/watch?v=lrnD7R9ohRs]Uchouten Kazoku[/url]
[url=https://www.youtube.com/watch?v=VyYCYd2wHY4]Tatami Galaxy[/url]
[url=https://www.youtube.com/watch?v=sWWDEnsn6l4]Kaiji[/url]
[url=https://www.youtube.com/watch?v=p2gNmdHwVk4]Sayonara Zetsubou Sensei[/url]
[url=https://www.youtube.com/watch?v=suLGzcL9eNs]Natsume Yuujinchou S2[/url]

Why is no one mentioning any of the SAO songs.

[quote=crazypoorer]Nope, I understood why it was disgustingly horrible in the first 10 seconds[/quote]

It seems your computer has swapped the world horrible with the word awesome. Might want to get that fixed.

[quote=BRSlove]http://www.youtube.com/watch?v=mUzNLayMrJk&feature=kp

Do I even need to explain why?[/quote]

Nope, I understood why it was disgustingly horrible in the first 10 seconds

[url=https://www.youtube.com/watch?v=cAYdHPvUn8s]Blood+ OP 1[/url]
[url=https://www.youtube.com/watch?v=kDh3D2ewiNs]Great Teacher Onizuka OP 2[/url]
[url=https://www.youtube.com/watch?v=YQIqgxeNtl0]Ghost in the Shell: S.A.C. 2nd GIG OP[/url]
[url=https://www.youtube.com/watch?v=NB2sow7tbJ8]Mawaru Penguindrum OP 2[/url]
[url=https://www.youtube.com/watch?v=KsyEa8nc8H8]Fullmetal Alchemist OP 4[/url]
[url=https://www.youtube.com/watch?v=eDU2H7q_sJI]Soul Eater OP 2[/url]
[url=https://www.youtube.com/watch?v=wlkj_FVL0so]Eureka Seven OP 2[/url]
[url=https://www.youtube.com/watch?v=PpbcuhaLxaA]Hyouka OP 1[/url]

http://www.youtube.com/watch?v=mUzNLayMrJk&feature=kp

Do I even need to explain why?

[url=http://a.pomf.se/mxgfvj.webm]tokyo ghoul[/url]
[url=http://www.youtube.com/watch?v=uY2QbtelmjA]Zankyou no Terror[/url]
[url=http://www.youtube.com/watch?v=y0M8adzh-hQ]bakuman[/url]
[url=http://www.youtube.com/watch?v=xIoah1E5o4o]Shinsekai Yori[/url]
[url=http://www.youtube.com/watch?v=p3978d97EsE]guilty crown even though the story was pretty bad, the animation was like eye candy <3 [/url]
[url=http://www.youtube.com/watch?v=RWqJZ_150h8]SAKURASOU[/url]

[url=https://www.youtube.com/watch?v=KbwoBQTc23o]Blue Gender OP (English version)[/url]
[url=https://www.youtube.com/watch?v=CxfIJr1RYwc]RahXephon OP[/url]
[url=https://www.youtube.com/watch?v=05p646nlYS0]Bokurano OP[/url]
[url=https://www.youtube.com/watch?v=0OCn_nVDrTM]Steins;Gate OP[/url]

[url=https://www.youtube.com/watch?v=lHRgSwVmz7w]GTO ED 2[/url]
[url=https://www.youtube.com/watch?v=Bz1508RBx2w]Outlaw Star ED[/url]
[url=https://www.youtube.com/watch?v=UHgvVGYJqO4]Blue Exorcist ED 2[/url]
Oh whoops. Just wanted openings. My bad. Couple endings too.

Higurashi no naku koro ni - First season opening

[url=https://www.youtube.com/watch?v=grZDIFS6HxE]Puella Magi Madoka Magica[/url]

[url=https://www.youtube.com/watch?v=DQ7R8K-6uUM]ClariS - Connect[/url]

I can't post links since I haven't been a member for 30 days but the Angel Beats and the Soul Eater op resonance are my favorites.

[url=http://www.youtube.com/watch?v=oUjqlVt6y2A]Baccano[/url]

Its not on YouTube but

Fate Zero Opening 1

One of the most addicting openings I've heard.
Carnival Phantasm OP
https://www.youtube.com/watch?v=uvbaM-URygs

[url=https://www.youtube.com/watch?v=fcNcCe8YE2E]The weeb room standby song[/url]