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When the turtles are all huddled around the campfire and mentally conjure the ghost or spirit of Splinter, they all get upset following the experience. Which turtle, though, is visibly crying (you can see tears on his face)?
Answer: Michelangelo
When the "Foot" ninjas find out where the turtles' hideout is located, they come in while the turtles are gone and kidnap their master, Splinter. The turtles return to April's apartment where they eventually engage in a large battle, leading to the burning down of April's building. The group flees to a house in the country. Leonardo is meditating one day and "hears" a communication from Splinter, seemingly telepathically. Leonardo gathers the rest of the group and they meditate together around a campfire. Their meditation leads to what appears to be the conjuring of the spirit of Splinter and Splinter speaks with them briefly. After their experience they are all upset by their emotional encounter with their kidnapped master. Only Michelangelo, though, allows himself to cry.