Trophy Description:Slipped, where wet.
Trophy Type:Bronze
This trophy can only be earned in the Scientists story.

Inside the Nuclear Launch Facility, on the third level down you will come across a yellow Slippery Floor hazard sign. Instead of warning you about a wet floor, this sign actually creates one. Pick it up with either SQUARE or CIRCLE and move it closer to the edge of any ledge in the area (the one you found it on is easiest). Then take a couple of steps back and run towards it. Your character will slip and fall down to the level below, which will net you this trophy.

The following video shows how to earn this trophy. Thanks to Admiral Vic: