[quote=VitaVitaAR]
... Why does going to the pony universe turn people into ponies? That doesn't make any sense.
[/quote]

I've never really gotten that myself XD Best I could figure, Defense mechanism? I mean, it's pretty damn disarming to suddenly find yourself turned into a horse XD what better way for sun-butt to avoid unwanted visitors going on killing sprees?

Or, ya know, just, ambient Life-form magic, kinda like how kingdom hearts turns Sora into every god damn thing and it's grand-mother when he crosses worlds XD