Unduplicatable Crash

Minecraft should launch

I looked away and when i looked back it said "Uhoh, it looks like the game has crashed!" Note: It was after playing largely laggy games and the launcher was launched threw Steam instead of manually.

I have had these problems before (rarely) launching the launcher normally. I have tried and tried and tried to duplicate it, but it won't happen. The crash report states that it was completely unexpected.