There's a rule for that.
I don't care, though. Sigs are hilarious most of the time. Especially when Reggie looks half knocked out.

well it also has to do with intent. if the intent is comedic, then it's not flaming/trolling.

his sig is within regulation, but it gets hard to tell. i try(as i am not a mod)to warn people about their sigs, and tell them to make sure to consult a mod after telling them about their sigs.

that's also one of those other things that's at mod discretion. 

Well, signs are usually for comedic purposes. I think if the sig. isn't posted in a serious way, then it shouldn't be banned.

It's to do with the message of the sig - one company is superior over another. 
Personally I do enjoy Sony products but really hate the idea of one company being better/making fun of the competition. It's a mindset that isn't helping the gaming community in any way.

Turkish is gonna get banned for his sig when the mods see it

Why is Kaz sitting backwards in 50cents car?

The PS4 dude, it's happening.

You'll be having spasms on the 20th when everyone has these Kaz signatures.

my fucking god I lol'd, spat coffee all over my screen :D saved for desktop background use!

edit - in all fairness tho, turkish's sig is just kinda funny as a fan of MS/Ninty over Sony myself... you have to lol at those gifs they're pretty class :D