Here is a picture of $3$ people eating food.
Can you spot who is a zombie amongst them? and why?
Taken From :- 7-Second Riddles
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For me the most likely candidate would be
The person on the left
Flies are mainly attracted to decaying organic filth such as rotting meat which I would assume is most like what a zombie would eat, rather than salad or eggs and toast. There is also some semblance of rigor mortis evident in this person's disposition.