Show with alien kid looked like human

This was either a movie or a tv show in English that I watched in class one day around 2006. It was in colour. There was an alien kid but he looked exactly like a human. When he ran, he ran funny with his elbows up moving side to side. There was a part in the movie where someone said you can’t sneeze with your eyes open. No one could do it but then he did because he was an alien and they became suspicious of him. His name may have started with the letter Z… This movie is possibly filmed in the early 2000’s. It could be a tv show episode though, not sure. Any ideas??

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