I brought signs to a SmackDown once (The one I remember was a red white and blue "Get Rowdy" or something for K Kwik and Road Dogg), and didnt get on TV... I just gave up after that and I dont bother with signs...
I yell and scream all the time at shows... Sometimes I use "Fuck" and "Shit" when I'm really into it...

(IE: After the Brock/Goldberg match at Mania, I yelled "NOW LETS HAVE A GOOD FUCKING MATCH!")
The one where I know I screamed the most was SuvivorSeries 02... I was screaming and yelling so hard that afterwards I felt sick and I had lost my voice... Same thing with Mania XX... I felt a little sick from yelling and I lost my voice...
I love going to shows and getting into them, it's fun...