graphical bug

this is for Minecraft 13w24a

What I expected to happen was the minecart looks normal.

What actually happened was the minecart had all the minecraft blocks in the game (the file that minecraft used before they made each block have it's own file. or as the pictures for paintings)
just found this, it can look like items, animals, or any texture depending on how u look at it

Steps to Reproduce:
1. place a minecart