Silverstream swims into Seapony Cay with her mom Oceanflow and brother Terramar.  
The trouble is Silverstream ends up breaking several dozen sea pony rules at Seapony Cay the first being never ever change into a hippogriff at Seapony Cay.  
To put it simply Mt. Aris is for Hippogriffs to enjoy the land and Seapony Cay is for Seaponies to enjoy the land.
 
The second rule is stay away from the humans and the third rule don’t touch or get near human made things.  
In this case Sileverstream changes into a hippogriff and ends on to the cruise ship the Sea’s Pride were comes across the most fascinating human built thing that could ever be made by humans a cardboard box.  
Magically Siliverstream watched as the human Dan opened up a box and all these neat looking colorful plastic pool toys came raining out of the box when Dan turned it upside down.  
Then Siliverstream saw in wounder as another human woman opened up a smaller box and a ton of boxes of icescream came poring out of it.  
Siliverstream then stuck her head into the box to see what she could get out of it when suddenly the box turned over on her and now thanks to the tape in the box was now stuck to the box.  
Siliverstream screamed I’m stuck in this thing and then ran away knocking into everything with her head trapped in the box.