2018 Bitcoin bomb threats

On December 13, 2018, thousands of businesses, individuals, schools, news agencies, and other places throughout the United States, Canada, and Australia received emailed bomb threats, warning that a "mercenary" of the sender of the email had placed a bomb in the receiver's workplace and demanding that a ransom of $20,000 be sent to a Bitcoin address to prevent the bomb from being detonated. Six schools in Australia's capital city Canberra were evacuated after threats.

Source: Wikipedia — 2018 Bitcoin bomb threats (CC BY-SA 4.0)