Original extra:
[mlweber@mattslap ~]$ sudo pacman -Sy gnome-terminal
:: Synchronizing package databases... 
:: current is up to date
failed to synchronize extra

Targets: gnome-terminal-2.16.1-2

Total Package Size:   2.2 MB

Proceed with upgrade? [Y/n] Y

:: Retrieving packages from extra...
error: failed to retrieve some files from extra



AFTER commenting out a line:
[mlweber@mattslap ~]$ sudo pacman -Sy gnome-terminal
:: Synchronizing package databases... 
:: current is up to date
failed to synchronize extra

Targets: gnome-terminal-2.16.1-2

Total Package Size:   2.2 MB

Proceed with upgrade? [Y/n] Y

:: Retrieving packages from extra...
error: failed to retrieve some files from extra