See, Trigger Scenery is based on all the other block events like Destruct and Collapse scenery, which end in the second-to-last frame because the last frame falls away in four pieces. Granted, they removed the falling pieces for Trigger Scenery, but the second-to-last-frame rule still applies. Shove whatever you want in the last frame - if you have a tileset with letters in it, get a bunch of animations spell out your name or a swear word or whatever floats your boat.