A few years ago, Tim Beasley opened his front door to discover that a small package had been left on the step.
"I was like 'what the heck is this?'. I opened the box, and went 'oh!', and I immediately threw it away."
Inside the box was a threatening note, alluding to physical violence if he didn't back off.
Beasley works for a US security firm called Semperis, and at the time he was involved in ransom negotiations on behalf of a US government organisation that had been hit by a cyber-attack.
The package delivered to his home in the US was a warning from the ransomware group he had been having to talk to.
But an increasing number of cyber attackers are now going further in their efforts to extort their victims - and threatening actual violence. The number of such physical threats rose more than twofold last year in the US, FBI annual data shows.