After hearing one blown twice in my section, I located (and much to my Wife's chagrin) let the offender know that he had been spotted and that security would be called if it was heard again.  He and a friend got up about half way through the 2nd quarter.  This was probably a bit over the line (emotion got the best of me) but I followed them...They stood under the Marshall section making phone calls until they realized I wasn't going to leave.  They left the stadium at half time.  Obviously they could have just walked back in, but at that time even a crowd whistle wasn't going to help them... 

I would love for these "idiots" to come on here and explain what the hell they're are thinking doing something like this.