I should really post this under a fake name.
Personal space is very important to me as I get panic attacks if too many people keep touching or leaning against me. Nothing scary like tearing off my clothes and running out of the parks screaming, but I may lose my breath or start to shake or cry. VERY EMBARRASSING!!
If someone is too close behind me in a line, I casually step BACK. A little at a time. If they don't back up after a bit.............I fart on them. Sorry, but it's the only thing that works sometimes.