What is the irony in a sound of thunder?

In a "Sound of Thunder," the irony lies in the unpredictable and chaotic consequences resulting from seemingly insignificant actions. The title suggests a significant event, yet it originates from a simple act, such as stepping on a butterfly in the past. This small alteration in the timeline leads to drastic changes in the future, highlighting the sensitivity of the universe to even minor disturbances. The irony lies in the disproportionate impact of a small action on the grand scale of events.