Last edited by...

In an attempt to confuse people, some forumers will have their signatures say "Last edited by... X"; the X being a variable that could be anyone's name. This makes it looks like another user had edited their post at some time.

Spread
Some forumers thinking the fad funny, edited their signatures to include "Last edited by..." as well. Soon many forumers posts appeared to have been edited by everyone from the then PERMA-BANNED forumer Flame593 to Billy Mays. Soon after the fad reached full steam, Dracophile complained, expressing his disdain for the fad. Usage of the fad dropped dramatically immediately afterwards, but it's still used from time to time.

Usage
Each forumer has a signature they can edit to say just about whatever they want. They can also use it to impersonate the "Last edited by..." message shown at the end of posts when they've been edited five minutes after posting by the user themselves or a moderator. This makes it look like another person had somehow edited their post for whatever reason.