I found a weird (AND AWSOME!!!!!!!!!!!!!!!!!!!!!!!!!) bug you shouldn't fix. When you make a superflat world, and make ice the top layer, and enter. I will give you step-by-step instructions.
Step 1:Place a poat on the ice.
Step 2:Go in the boat an try to move. YOU WILL MOVE SO FAST!!!
This is not a place for suggestions.