WOLLONGONG, Australia -- A honk at a McDonald's drive-thru escalated into a six-week stalking and harassment campaign that ended with a bomb blast, prosecutors in Australia claim.

According to Newsweek, a couple was at the fast-food drive-thru on Feb 22 when somebody swerved dangerously close to their car, and the couple honked their horn. A woman in the vehicle that swerved apparently didn't appreciate the beep and confronted the couple before the victims drove away, investigators allege.

Normally, that would have been the end of an unfriendly encounter. But, prosecutors say that wasn't the case here. Instead, she allegedly went home and complained to her partner about the couple's honk.

Police told The Sydney Morning Herald that "ingenious" methods were then used by the woman and the partner to track down the couple who honked. From there, investigators say the couple's car windows were smashed, and they began receiving threats online. On March 5, the newspaper says the couple's Ford Ranger was blown up with what has been described as a "sophisticated" explosive device.

Ryan Sharp, 33, and his 31-year-old counterpart were arrested. According to The Guardian, he faces a handful of charges related to making threats, damaging property and planting a bomb. She is charged with being an accessory after the fact.

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