I was playing on a Multiplayer server then my computer got a warning saying Java was taking up to much space.
It was like this:

[14:17:09 INFO]: Client> # A fatal error has been detected by the Java Runtime Environment:
[14:17:09 INFO]: Client> #
[14:17:09 INFO]: Client> # java.lang.OutOfMemoryError: requested 32744 bytes for ChunkPool::allocate. Out of swap space?
[14:17:09 INFO]: Client> #
[14:17:09 INFO]: Client> # Internal Error (allocation.cpp:117), pid=1067152, tid=5520
[14:17:09 INFO]: Client> # Error: ChunkPool::allocate
[14:17:09 INFO]: Client> #
[14:17:09 INFO]: Client> # JRE version: 6.0_14-b08
[14:17:09 INFO]: Client> # Java VM: Java HotSpot(TM) 64-Bit Server VM (14.0-b16 mixed mode windows-amd64 )
[14:17:09 INFO]: Client> # An error report file with more information is saved as:
[14:17:09 INFO]: Client> # C:\Users\Charlie\AppData\Roaming\.minecraft\hs_err_pid1067152.log
[14:17:09 INFO]: Client> #
[14:17:09 INFO]: Client> # If you would like to submit a bug report, please visit:
[14:17:09 INFO]: Client> # http://java.sun.com/webapps/bugreport/crash.jsp
[14:17:09 INFO]: Client> #
[14:17:11 INFO]: Client> AL lib: (EE) alc_cleanup: 1 device not closed
[14:17:12 ERROR]: Game ended with bad state (exit code 1)
[14:17:12 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[14:17:12 INFO]: Deleting C:\Users\Charlie\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9-natives-72093842171487
[14:17:12 WARN]: Couldn't delete C:\Users\Charlie\AppData\Roaming\.minecraft\versions\1.7.9\1.7.9-natives-72093842171487 - scheduling for deletion upon exit

I've never seen this bug, and it temporarily shut down my P.C when it happened. As im writing this, it said it again. I was playing with nothing else on but minecraft. Also, it froze up the whole computer once, saying Microsoft Windows was not responding. It's strange since I usually play with nothing on but Minecraft and sometimes Chrome in case i need to report bugs. I can't get a screenshot, so sorry.