A380 slides
Have to agree with everyone with the slides. Just did my cabin crew training with Monarch, going down a single lane slide in their 757 mock up. That in itself was rather daunting, picking up a considerable speed before hitting the deceleration pad which really does get u up on your feet and throws you forward.
A number of people, even after a few times down the slide were falling over at the bottom, forcing us to slow down the evacuation at the top.
Change the scenario to that of the upper deck of a A380, fire, smoke, darkness... People will be crushed to death at the base of the slide.