There was a fantasy movie I watched in reruns in the '70s where an adventurer and his trickster friend had to (near the end of the movie) get through a cave to get a critical/magical treasure. Inside the cave was lots of fog, and lots of traps to tempt the travelers to stray off the path where, I think, they would be turned to stone. I remember one of the traps was the illusion of someone being crushed by an enormous snake.
The adventurer was tempted off the path by someone who looked like they were in trouble. But the trickster friend wasn't tempted. In fact, when mysterious voices insulted the purity of his mom he shouted back "true too!".