It just violently crashes.

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 2/27/13 6:03 PM
Description: Updating screen events

java.lang.VerifyError: (class: axa, method: a signature: (Lavx;)V) Incompatible argument to function
at bjw.a(SourceFile:231)
at axi.a(SourceFile:72)
at bjw.a(SourceFile:470)
at axi.d(SourceFile:127)
at axi.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1076)
at net.minecraft.client.Minecraft.K(SourceFile:572)
at net.minecraft.client.Minecraft.run(SourceFile:524)
at java.lang.Thread.run(Unknown Source)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bjw.a(SourceFile:231)
at axi.a(SourceFile:72)
at bjw.a(SourceFile:470)
at axi.d(SourceFile:127)
at axi.m(SourceFile:111)

– Affected screen –
Details:
Screen name: bjw
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1076)
at net.minecraft.client.Minecraft.K(SourceFile:572)
at net.minecraft.client.Minecraft.run(SourceFile:524)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 13w09b
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 382056576 bytes (364 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2202, Intel
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~_ERROR~ NullPointerException: null