I once gave a semi-satirical speech about the need to learn how to be good liar.
My point was that by studying how to lie and practicing it, you can greatly improve your ability to detect it.
In my military days, a power generator failed and power to the facility was lost. A co-worker asked if I knew what causes the generator to fail, and I looked him steadily in the eye and told him a giant snake had gotten into the generator.
When I say him the next day, he asked me how I did it.
“Did what?” I asked.
He had always believed that it was impossible to look someone in the eye and lie. I like to think I ‘woke’ someone up that day.