Rubberband Effect
From UO Second Age
The Rubberband Effect occurs when a player tries to run over an impassable item that exists on the server but not on the client. The client thinks there is no item to block the player, so for a split second the client allows the player to walk onto the tile. Once the client realizes that the server won't allow this, the player is instantly bounced back to their original location. The visual it produces is analogous to a rubberband snapping.
