Hmm, can't decide if Apple Bloom is screaming in excitement, like on a roller coaster, or because she thinks she's gonna die. I think I'll interpret it as shrieking in terror. It's funnier that way.
By the way, very minor thing, but should I point out the slight layering issue where the handlebar connects to the scooter base? At least I'm pretty sure the gray should be behind the blue. It looks like one of those annoying infinite-staircase situations where object A is above part of Object B, which is above Object C, which in turn is itself above some other part of Object A.
Yeah, that's what I figured was more likely, but it amuses me more to imagine it more like, "For the love of all things apple-related, SLOW DOWN! We're all gonna die!" or maybe just incoherent shrieking.
By the way, your icon is oddly entertaining to watch.