The Token Good Teammate of the terrorists calling his comrades out over them trying to kill children.
The Creeveys and Cedric charging Voldemort in an effort to stop him succeeding. It doesn't work, but points for effort.
Voldemort, Bellatrix and Greyback versus Lily Potter and the loyal Marauders. Even better, James Potter actually manages to force Voldemort back for a few seconds.
The Marauders shape into their Animagus forms for battle, which is pretty cool. Greyback and Voldemort's response? Greyback hulks out and Voldemort turns into a giant serpent. He wins with pretty much no effort.
The wizards of London save the city from getting nuked. Sure, magic is exposed, but a price that's worth paying in the face of getting vaporized.