Strong people don't put others down. They lift them up.
This joke is a humorous twist on a famous quote often attributed to American motivational speaker Michael P. Watson: "Strong people don't put others down. They lift them up." The original quote is meant to convey the idea that truly strong individuals empower others rather than belittle them.
In the context of the picture featuring Darth Vader, a notorious villain from the Star Wars franchise, choking someone while saying this quote, the humor arises from the irony of the situation. Darth Vader, known for his oppressive and authoritarian nature, is doing the opposite of what the quote suggests. Instead of lifting the person up, he is literally lifting them up by choking them, which is a form of putting them down in a very literal sense.
The joke plays on the unexpected contrast between the benevolent sentiment of the quote and the violent actions of Darth Vader, creating a humorous juxtaposition. It relies on the audience's familiarity with the character of Darth Vader and the original quote to find the irony amusing.