When closing a chest minecraft will often crash:

Time: 4/24/13 3:29 PM
Description: Updating screen events

java.lang.IndexOutOfBoundsException: Index: 79, Size: 45
at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.get(ArrayList.java:382)
at tj.a(SourceFile:318)
at bds.a(SourceFile:287)
at ayl.a(SourceFile:581)
at ayl.a(SourceFile:596)
at axr.n(SourceFile:153)
at axr.m(SourceFile:115)
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Thread.java:722)

I have 120 crash reports I could attach, but I'll just attach the most recent unless you want more. It crashes often.