Crashed Game

Put the summary of the bug you're having here

*What I expected to happen was...: that my computer would load the game as normally
Describe what you thought should happen here

What actually happened was...it crashed after a few laggy seconds into the game:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...Open minecraft
3. ...click play