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Tear Jerker: Dora the Explorer
During Dora's Christmas Carol Adventure, when in the future, Swiper finds out that because he was in the naughty list, his older self has become bitter and a real thief. And despite being surrounded by presents, you can tell that why Old Future Swiper looked down was because he had everything and yet has no friends at all.
And another sad moment comes for when in the same special, near the end, everyone else gets presents, but Swiper doesn't. He looks as if he's about to cry from his reaction.