objects/oUFOCrash/alarm_0.gml
From spelunky.gmk, Spelunky Classic 1.1's source, © 2008, 2009 Derek Yu and Mossmouth, LLC, shown whole under the Spelunky User License v1.1b. Extracted by spelunky.ai's tools, an unofficial fan project, one file per script or event; the // ==== lines are the extractor's, naming each action of the event. Some scripts are others' work that Derek Yu credits in the source's readme.txt: Martin Piecyk's platform engine, ChevyRay's view scaling scripts and tsg1zzn's Super Sound System.
oUFOCrash's alarm 0 event, 3 lines of GML.
if (rand(1,2) == 1) instance_create(x+rand(0,16), y+rand(0,16), oFlameTrail);else instance_create(x+rand(0,16), y+rand(0,16), oBurn);alarm[0] = 3;