I've heard some good one's lately, like the female who empathized with the widow of a fallen service member by telling her that she had lost her dog the month before, but this bit of guidance needs to be spread far and wide:
It is a real issue, with real problems, and Hollyweird ain't helping (along with others). I've seen some jackass responses even within my own local community to something that happened because of PTSD. Thankfully, local leaders have a brain and use it on the issue...
Please read, share, and be a part of the solution rather than the problem. If you know someone with PTSD, be there for them, help them get help, and do what you can. If you have it, talk to others who have been there and get help when and where you can. If you are thinking of checking out, check out this out and keep this number handy: 1-800-273-8255. Call it.