Lightman takes the leader of a self-help group to task on the episode "Beyond Belief." The latter is played by David Sutcliffe.
The character played by David Sutcliffe believes he's helping people on Lie to Me. Lightman, however, thinks differently.
As a self-help leader speaks on video, Lightman watches him in action in this scene. It's courtesy of the episode "Beyond Belief."

Lie to Me Season 3 Episode 6 Quotes

What a load of old bollocks John. Your name is John, right?


Lightman: John Stafford is responsible for your mom's suicide attempt.
Danielle: Are you asking or telling me?
Lightman: I am just telling you what you want to hear love.