I believe the couple were investigating the asylum, or maybe looking for someone.  One or both are given a tour.  At one point one or both look through the window of a locked door and see a space filled with the most monstrously insane.  Later they are fleeing from the owner/manager/head doc and – in a rush – they open a door without realizing where they are and accidentally lock themselves in with the “monsters.”

An old “Indiana Jones” type action adventure, in English,  I saw probably in the 1970’s. I remember it in black and white but it might have been a black and white TV. At the end, a man and a woman escape (an island? under attack? a disaster?) with a load of treasure, but in order to gain altitude, they must throw all the treasure out. When everything has been thrown out, the man looks at the woman and realizes she has hidden an enormous gem in her mouth. She takes it out and utters some pithy line, and the movie ends.