In real life, Big Bird would have probably become suicidal. No one believed him about Snuffleupagus. He probably would have gotten mad at Snuffleupagus for showing up every single godamn fucking time no one else was around. He'd probably start saying "What the fuck do you want, you lousy hairy beast, you long-schlong-nosed child-molesting fuzzy elephant. Get the fuck out of my face." No, but seriously, Big Bird would have likely developed symptoms of paranoia. If Snuffleupagus WAS hurting Big Bird, and nobody believed he was there anyway, it would have been a very confusing thing for Big Bird to even mentally handle. People would have started to get annoyed with Big Bird for playing the stupid Snuffleupagus game and/or to think Big Bird was cracked. In real life they probably would have Baker Acted Big Bird for his delusions, even just for being so annoying about it. People would have started saying to him "Big Bird, I think you need some help." Big Bird probably would have started getting reactionary with people, thinking everyone was thinking he was crazy or just being a pain in the ass for insisting that Snuffleupagus was actually a real, fuzzy brown, long-eyelashed, loping elephant-looking massive puppet populated by two persons in a big fuzzy elephant suit. Big Bird would have started questioning his reality. He might have discovered himself to be nothing but a puppet, a puppeteer's words coming out his own beak. He would probably become less and less willing to talk to anybody because everyone would just tell him he was crazy. He might discover himself to be low down, and stunned by his isolation. And that godamn dopey duh-talking elephant who batted his eyelashes and got in Big Bird's nest with him, what a jerk. He should have made some other friends and not made such a mess of Big Bird's life.