Trigger Item was a joke item to be included in Super Smash Flash 2. It was confirmed on April 1, 2011 as part of an April Fools prank on an update that merely stated that the Smash Flash DOJO!!! would no longer be updated, but if someone continues scrolling down the page, they would notice the Trigger Item's confirmation.
The Trigger Item would take the appearance of any other items and, hence the name, when a character was to approach it and grab it, it would explodes in the form of the "Objection!" speech balloon (from the Ace Attorney series) which would send the character flying. The Trigger Item was also meant to explode in the form of the "Hold it!" speech balloon, which would render immobile the character who picked up it.