From the fine article:

> The agents told Afifi they had other agents outside Khaled’s house.
>
> “If you want us to call them off and not talk to him we can do that,” Afifi said they told him. “That was weird. [...] I didn’t really believe anything they were saying.”

So it was worth covertly monitoring Khaled, but OK to mention it to his friend? And then ask if they wanted them to stop?

Dear FBI, who are presumably listening, neither myself nor any of my friends are terrorists, so you don't need to monitor us or infringe any of our rights. We're boring. Thanks.

Similar experience here - they called, got me to run event viewer. I lied and told them there were only Info and Warning messages - but he still exclaimed "OMG! you have a virus!" it was when he said "Now, it's very important - do not click anywhere or your computer will break" that I couldn't hold back and gave him a rant at how ludicrous he was being and asking what he's trying to scam. They hung up.

Of course, warnings and errors are completely run of the mill in Event Viewer (mine are mostly the DHCP service noting that I lose my address whenever I suspend my laptop)