I have a similar one! I did house calls. I got called out on a warranty call, someone said a coworker of mine didn't fix the problem. I look in the notes and the coworker says he did a standard virus removal, suggested virus protection but was turned down.

I get there and sure enough it's riddled with viruses again. Coworker was legit, notes all in order, I tell the client that this isn't a warranty issue, the work was done, and it has now been reinfected and will need another removal. He seems fine with this, but his wife flips out and demands I prove it got reinfected.

I suggest that we can check the web history. Since it was popping up ads, we'd see when the pop-ups started, and more importantly we'd see if they had stopped after coworker left. Guy says that's unnecessary, it definitely got reinfected, and this time he'll buy an antivirus. Wife is having none of it, says go ahead and check and I'll see the problem was never fixed. I ask if they're sure, guy kind of resignedly says to do it.

I'm not one to kink shame, but when all the trans porn site titles came up, the dude was clearly mortified. I didn't get very far into trying to figure out if I can prove it's related before the wife says "just fix the damn thing" and stormed out. I hope it wasn't too bad for him, she seemed a bit difficult to deal with.