Whoops - Better PHP Error Messages
In Local Environments (and local environments only), you can enable Whoops Error Messaging.
Whoops provides a cleaner, more helpful interface for viewing errors when they happen, including a clear callstack, server details at the time of the error, preview of the code that errored, and all sorts of other goodies.
To enable Whoops, simply add
define( 'WHOOPS_ENABLE', true ); to your local-config.php.