Before Swarm of the Century, we had certainly seen many of Pinkie's antics that didn't make much sense.  We can see that she's trying to do something here that seems important, but we really don't understand why.  Which makes for an interesting story that seems a little different from most everything else in MLP.

DRWolf Narrator by DavionXY:
http://davionx.deviantart.com/art/DrWolf-Narrator-377863090

All other Character and Images belong to Hasbro.