Holding the "3" and "2" keys during boot will boot OSX into 32-bit kernel mode.
This is exceptionally useful for the kernel panics a lot of the 2011 MBPs often get with USB iPhone tethering (which is hilarious, btw).
One of the cool things about OSX is that 64-bit apps can still run in 64-bit mode when the kernel is in 32-bit mode.
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