An 8-year-old boy from Hazleton, Pennsylvania, is being hailed for saving his 20-month-old sister, Leila Dempsey, from choking. The young man had seen an episode of Nickelodeon’s “The Substitute” that featured wrestler and actor John Cena where he provided tips on how to save someone choking. The siblings were in a car with their dad going for a haircut when Leila started to choke on a chicken nugget. “I was just listening to music, I think. Then I heard her choking,” said Jaxson, Inside Edition reported. “I looked to my left and saw my sister’s face purple and red, so I patted her on the back, told my dad to pull over, then I started patting her on the back, and I dislodged a nugget.” Jaxson credits the TV show for teaching him how to save someone’s life. “It’s called The Substitutes on Nickelodeon, and in the very first episode, …