When all of them get "Twitterpated" for that matter.
The skating scene
Adult Bambi sharpening his antlers on a tree Friend Owl was resting on. While he is shaking, he sees a "herd" of Bambis.
Friend Owl:(seeing lots of Bambis) Get outta here! All of ya! (stops shaking, sees one again) And you too!
Friend Owl's mockery of the birds' singing every spring can count as this:
Friend Owl: "Tweet tweet, tweet tweet! Tweet tweet, tweet tweet!" Love's sweet song. Hmph! Pain in the pinfeathers, I call it!
Really, most of what the young animals say and do. They aren't just big-eyed babies with sweet voices; they really act like four year old kids.
Two baby birds fighting over the berries their mother gave them. Another baby bird, that appears to be the oldest, ate all the berries. The two stop fighting to see they're gone. Its probably karma that that particular bird had a raindrop hit his head.
Bambi's first meeting with Faline.
Faline: Hello, Bambi! (Bambi backs away) I said, hello! Bambi's mom: Aren't you going to answer her? (Bambi shakes his head) Bambi's mom: You're not afraid are you? (Bambi shakes his head frantically, then gulps) Bambi's mom: Well then go ahead. (she pushes him towards Faline) Bambi's mom: Well go on, say hello. Bambi:(lowers his head in defeat)...hullo. (Faline squees and starts jumping around at him)
Bambi's pathetic attempt at a 'roar'. It also doubles as a Chekhov's Gun at the climax of the film when he uses it to draw the hunting dogs away from his would be step mom.