The Flop Block
The Flop Block is a glitch discovered by a member of YouTube named TaleOfTheToaster (under the account 'torngentleman2', however) in Super Smash Bros. Brawl. Not much is known about the glitch currently, not even the discoverer could explicitly state how it is triggered, however, it is known to work roughly by activating a drop block, walking up a slope, and back to where the drop block would be, at which point the player would teleport into the bottom blast line. It is currently confirmed only to work with Mario, Luigi and Lucas, but it very likely to work with all characters. This glitch was originally known as The Fly Box, but was in May 2011 renamed to The Flop Block.
This glitch is unrelated to the Teleport glitch, another teleportation-based glitch involving drop blocks.
Video
http://www.youtube.com/watch?v=ZTiDnU4cmnA