in H1 i have to say the first time meeting the flood. in H2 it be the rolling across the bridge with the scorpion blasting the ghosts and how Arbiter made friends with Chief. H3 would be killing Truth cause i hated him. ODST is roaming the city at night alone. Halo Wars sucked. and H4 is unknown
oh and reach is when me and my cousin got the secret room on the package