DECORATE
ACTOR TrashCan1
{
  Game Doom
  Radius 16
  Height 40
  +NOBLOOD
  +SOLID
  +SHOOTABLE
  Health 20
  Scale 0.5
  States
  {
  Spawn:
    TRAC A -1
    Stop
  Death:
    TNT1 A 0 A_PlaySound("props/randommetalcrash")
    TNT1 A 0 A_SpawnItemEx("ScrapGravity")
	TNT1 A 0 A_Jump(128, "End")
	TNT1 A 0 A_SpawnItemEx("ScrapGravity")
	TNT1 A 0 A_Jump(128, "End")
	TNT1 A 0 A_SpawnItemEx("ScrapGravity")
  End:
    TNT1 A 0
	Stop
  }
}

SNDINFO
$random props/randommetalcrash { props/mcrash1 props/mcrash2 props/mcrash3 props/mcrash4 }
props/metalcrash1 mcrash1
props/metalcrash2 mcrash2
props/metalcrash3 mcrash3
props/metalcrash3 mcrash4

Using a pk3, the sounds are in the Sound -> Props folder.