That moment you reach a place and realise exactly where you are. It reflects the moment where your hippocampus (the brain structure involved in memory and navigation which stores maps of the environment you have visited before) recognises that you have been to a place before and merges two cognitive maps together (onemap made when you visited in the past and the map made in the present).
I am used to go to the supermarket by taking Broadway, but yesterday I was on South street and reached the supermarket. I had a hippocampusmoment! I realised South street leads to broadway!
When you want people to believe your fake story, so you make up a fake scientific explanation with big words and technical terms as to why your story must be true. The goal is to misdirect non-expert questioners and listeners, who don't have enough technical knowledge to pick apart your actually very weak explanation.
"What is your proof that aliens abducted you in the middle of the night 36 years ago and then let you go, leaving no evidence?"
"It's indelible in the hippocampus."