I have made pretty much every joke you can think of.
Usually involving telekinesis, telepathy, teleportation, clairvoyance, chi balls, seeing through walls, lasers, the matrix, stopping bullets using chi, exploding all their blood vessels using chi, the big bang being caused by a kung fu master using his extreme chi, yoda using chi in star wars, switching from coal powered fire stations in Beijing to chi powered fire stations to reduce smog etc
When I'm bored on the train I try to spend that time fruitfully by thinking of new material.