When you flinch unconsciously at another's gesture in conversation, more than once. Then - explain why.
THEN (lets have fun with this:) do the hookah dance, yell - "TAWANDA!!!!" Smear peanut butter all over yourself and go up to people at the mall asking "Got Jelly? I'm a sandwich" .... THEN, Laugh out of context; for example someone asks you 'how are you doing?' You point, stare and bwwwwwhahahahah - "your too funny" turn calmly & walk away. and FINALLY you know you have PTSD when you :: go up to people at your local psychiatrists office and say "I'm lost. I've gone to look for myself. If I should return before I get back, please ask me to wait." < You can do this at any medical conventions as well> :woot::wideeyed::brb::confused::wacky: