This bug will crash your Minecraft. I only experienced this big on the multiplayer screen by me Witheringtrout4. To trigger bug follow instructions:
1.Go to multiplayer screen.
2.Hold down left shift.
3.Rapidly tap the down button.
4.Your screen WILL freeze.
5.You will get a message saying Minecraft has crashed.
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Confirmed in 13w07a, attached the crash report.

Note:
Description: Updating screen events
java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at bbp.a(SourceFile:51)
at bbp.a(SourceFile:67)

Note this too:
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
This is the last line of the crash report
Edit: Shortened snippet of report

@Dean Baset: The notes in the comments with a snippet of the relevant part of the crash report are for the searchability. Jira searches only in title, environment, description and comments, but not in attached text files.

@Kumasasa what are you trying to say?

@Dean Baset: Just explained the use of the crash report snippets, nothing else.

I could not find any existing issue that contains any of the crashes mentioned here. However, all of the crash reports that you have provided are from a modded version of Minecraft. Please try to reproduce the crash in a vanilla (non-modded) version of Minecraft and attach that report or this may be dismissed as being caused by a mod.

I don't have a modded version of Minecraft. I don't even have a texture pack installed!

@Spam Golem

Please ignore the bot 🙂

Confirmed for 13w19a

Confirmed for unmodded Minecraft 13w19a.