Half-Life 2 Easter Egg - Cremator

In Eli's Lab, one of the many items preserved is a strange helmet (very different to the Combine Helmets) which Eli's claims Alyx brought in and they don't know what it's for but this is a sly addition of one of the many factors that didn't make it into the game, this is actually the head of cut enemy The Cremator, originally intended to be the Combine equivalent of bin men, which would turn nasty and attempt to kill you with their disintegratetors (also planned as a weapon, one of the many hidden ways Valve recycled their old ideas.