True story. 1974, I go into the Deutsche Bank Frankfurt, to cash a travellers cheque. No plastic in those days.
I was a bank clerk back then, so the teller offered to show me around the place, then suggests we meet for dinner. His name was Martin Uffer.
Martin takes me to a basement cafe in the heart of the city, near Zeil, and introduces me to his friends. There is a strongroom door to one side, with people coming and going, and locking it tight each time.
I hadn't noticed that there were no women in the place.
After the meal, he suggests that we adjourn into the room behind the door, saying that I will be in for a treat. When we go in, I find that it is a pistol range - and there are Nazi flags and photos all over the walls. What really freaked me out were a couple of guys in pink Nazi uniforms.
Suddenly the penny dropped - I was trapped in a room with gay Nazis carrying live weapons. Luckily, someone came into the room and the door was open, so I leaped through the door, up the stairs, and ran for about three blocks before I took a breath. I was very fit back then and made sure I put a lot of distance between myself and that place.
Next day, I hopped on my bicycle and pedalled as fast as I could to Heidelberg.