Floating Hat

In the level 'Cairo Staion' after the cinematic rolls, as you descend on the stairwell, you will turn and there will be several SMG's and Battle Rifles. Melee the crate with the Naval Officers hat on it repeatedly. The crate will eventually slip from under the hat, and the hat will be there, motionless. You can't do anything else with it. It's just a minor programming error by bungie