One of the methods to get beaten up by taxi driver

When your naive junior researcher asks the taxi driver who is giving off musty, humid, just woke up smell:

"What is that bad smell in your car?"

Driver menacingly "say again? what?" - followed by tension filled silence. Like tension while one decides which wire to cut to diffuse the bomb.

Ahem. *slaps palm over colleagues mouth*

All happening within 1 minute.